血管病变-话题@MedSci

#血管病变#

96篇内容 | 3103人围观

关注话题

话题活跃用户

#插入话题

插入图片

最新最热

[GetTopicListResponse(id=1391090, encodeId=546b139109035, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=JACC：糖尿病患者多支血管病变的长期存活率, objectType=article, longId=160528, objectId=c7f916052896, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=c7f916052896, replyNumber=0, likeNumber=71, createdTime=2019-02-21, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=c7f916052896, moduleTitle=JACC：糖尿病患者多支血管病变的长期存活率, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=c7f916052896)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391089, encodeId=7bd4139108960, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Stroke：血脑屏障渗漏和微血管病变与脑-淀粉样血管病造成的脑损伤有关, objectType=article, longId=160314, objectId=e2af1603149a, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=e2af1603149a, replyNumber=0, likeNumber=93, createdTime=2019-02-19, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=e2af1603149a, moduleTitle=Stroke：血脑屏障渗漏和微血管病变与脑-淀粉样血管病造成的脑损伤有关, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=e2af1603149a)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391088, encodeId=5c65139108884, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Blood：血栓性微血管病变是BCR-ABL1酪氨酸激酶抑制剂帕纳替尼引发心血管毒性的原因之一, objectType=article, longId=159627, objectId=aaa415962ed1, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=aaa415962ed1, replyNumber=0, likeNumber=60, createdTime=2019-02-09, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=aaa415962ed1, moduleTitle=Blood：血栓性微血管病变是BCR-ABL1酪氨酸激酶抑制剂帕纳替尼引发心血管毒性的原因之一, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=aaa415962ed1)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391087, encodeId=154b139108e3a, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Hypertension：脑血管病变对高血压患者认知的影响, objectType=article, longId=157328, objectId=4ba715e328a7, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=4ba715e328a7, replyNumber=0, likeNumber=92, createdTime=2019-01-06, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=4ba715e328a7, moduleTitle=Hypertension：脑血管病变对高血压患者认知的影响, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=4ba715e328a7)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391086, encodeId=f7a113910860f, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=合并心肌病和瓣膜病的冠脉微血管病变：降压、调脂、控糖有效, objectType=article, longId=156324, objectId=3fa41563240d, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=3fa41563240d, replyNumber=0, likeNumber=56, createdTime=2018-12-22, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=3fa41563240d, moduleTitle=合并心肌病和瓣膜病的冠脉微血管病变：降压、调脂、控糖有效, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=3fa41563240d)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391085, encodeId=1db51391085cf, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Arthritis Rheumatol：系统性硬化症中尺动脉闭塞与血管病变严重程度标志物, objectType=article, longId=155921, objectId=a0fc15592199, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=a0fc15592199, replyNumber=0, likeNumber=52, createdTime=2018-12-18, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=a0fc15592199, moduleTitle=Arthritis Rheumatol：系统性硬化症中尺动脉闭塞与血管病变严重程度标志物, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=a0fc15592199)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391084, encodeId=891a139108417, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Circulation：微血管病变在心肌缺血起关键作用：分为4型，用4条标准可诊断, objectType=article, longId=150856, objectId=a1c71508569b, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=a1c71508569b, replyNumber=0, likeNumber=75, createdTime=2018-10-13, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=a1c71508569b, moduleTitle=Circulation：微血管病变在心肌缺血起关键作用：分为4型，用4条标准可诊断, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=a1c71508569b)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391083, encodeId=8cfd139108347, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=J Infect Dis：水痘带状疱疹病毒血管病变研究进展J Infect Dis：水痘带状疱疹病毒血管病变研究进展, objectType=article, longId=149813, objectId=365c14981347, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=365c14981347, replyNumber=0, likeNumber=86, createdTime=2018-09-29, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=365c14981347, moduleTitle=J Infect Dis：水痘带状疱疹病毒血管病变研究进展J Infect Dis：水痘带状疱疹病毒血管病变研究进展, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=365c14981347)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391082, encodeId=b76d139108282, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Hypertension：急性心肌梗死后高血压、微血管病变与预后, objectType=article, longId=144608, objectId=dd3714460816, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=dd3714460816, replyNumber=0, likeNumber=86, createdTime=2018-07-19, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=dd3714460816, moduleTitle=Hypertension：急性心肌梗死后高血压、微血管病变与预后, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=dd3714460816)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391081, encodeId=d49113910815b, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=EuroPCR2018丨多支血管病变患者血管成形术后即刻和延迟血运重建的结局, objectType=article, longId=139241, objectId=22b613924171, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=22b613924171, replyNumber=0, likeNumber=62, createdTime=2018-05-28, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=22b613924171, moduleTitle=EuroPCR2018丨多支血管病变患者血管成形术后即刻和延迟血运重建的结局, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=22b613924171)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391080, encodeId=073f139108065, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=【收藏】23种肾血管病变的影像学表现汇总, objectType=article, longId=138212, objectId=0d801382129a, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=0d801382129a, replyNumber=0, likeNumber=59, createdTime=2018-05-17, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=0d801382129a, moduleTitle=【收藏】23种肾血管病变的影像学表现汇总, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=0d801382129a)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391079, encodeId=467313910e9fd, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=合并多支血管病变高危心梗患者：抗血小板治疗也需更强、更长, objectType=article, longId=137208, objectId=3b4f13e208e8, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=3b4f13e208e8, replyNumber=0, likeNumber=76, createdTime=2018-05-05, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=3b4f13e208e8, moduleTitle=合并多支血管病变高危心梗患者：抗血小板治疗也需更强、更长, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=3b4f13e208e8)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391078, encodeId=9ff913910e833, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Stroke：2型糖尿病对脑小血管病变的影响！, objectType=article, longId=136450, objectId=618813645090, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=618813645090, replyNumber=0, likeNumber=109, createdTime=2018-04-27, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=618813645090, moduleTitle=Stroke：2型糖尿病对脑小血管病变的影响！, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=618813645090)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391077, encodeId=491213910e791, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=基层糖尿病微血管病变筛查与防治专家共识, objectType=article, longId=132590, objectId=4c3e13259009, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=4c3e13259009, replyNumber=0, likeNumber=35, createdTime=2018-03-17, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=4c3e13259009, moduleTitle=基层糖尿病微血管病变筛查与防治专家共识, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=4c3e13259009)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391076, encodeId=36fe13910e61c, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=冠心病三支血管病变伴左心室憩室超声表现1例, objectType=article, longId=130263, objectId=ff781302631e, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=ff781302631e, replyNumber=0, likeNumber=62, createdTime=2018-02-23, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=ff781302631e, moduleTitle=冠心病三支血管病变伴左心室憩室超声表现1例, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=ff781302631e)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391075, encodeId=466013910e5c4, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=J INTERN MED：CAIDE痴呆风险评分与老年痴呆症和脑血管病变有关！, objectType=article, longId=128018, objectId=c81712801816, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=c81712801816, replyNumber=0, likeNumber=89, createdTime=2018-01-29, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=c81712801816, moduleTitle=J INTERN MED：CAIDE痴呆风险评分与老年痴呆症和脑血管病变有关！, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=c81712801816)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391074, encodeId=a9bd13910e4a5, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=A J Resp Crit Care Med：警惕：常用戒烟药可能增加心血管病变的几率, objectType=article, longId=124107, objectId=033a12410e44, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=033a12410e44, replyNumber=0, likeNumber=68, createdTime=2017-12-22, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=033a12410e44, moduleTitle=A J Resp Crit Care Med：警惕：常用戒烟药可能增加心血管病变的几率, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=033a12410e44)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391073, encodeId=cbf713910e3e6, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=先心病中较常见的外周血管病变一例, objectType=article, longId=122560, objectId=9f3e122560a7, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=9f3e122560a7, replyNumber=0, likeNumber=59, createdTime=2017-12-08, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=9f3e122560a7, moduleTitle=先心病中较常见的外周血管病变一例, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=9f3e122560a7)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391072, encodeId=0a2c13910e28f, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Stroke：中年时全身炎症与老年白质完整性与脑小血管病变有何关系？, objectType=article, longId=118734, objectId=eec6118e346c, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=eec6118e346c, replyNumber=0, likeNumber=83, createdTime=2017-11-05, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=eec6118e346c, moduleTitle=Stroke：中年时全身炎症与老年白质完整性与脑小血管病变有何关系？, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=eec6118e346c)], followStatus=false, userIsMember=false, type=1, lengthMark=0), GetTopicListResponse(id=1391071, encodeId=1f9413910e1da, content=<a href='/topic/show?id=6d0689e19f0' target=_blank style='color:#2F92EE;'>#血管病变#</a>, objectTitle=Neurology：急性缺血性卒中患者血脑屏障渗漏与小血管病变之间的关系如何？, objectType=article, longId=117688, objectId=78cd11e688a3, topicUrl=null, isHasObj=0, objectCover=null, objectUrl=/article/show_article.do?id=78cd11e688a3, replyNumber=0, likeNumber=62, createdTime=2017-10-28, rootId=0, userName=124987c6m36暂无昵称, userId=85152500072, projectId=1, avatar=, status=1, hasArticle=1, attachment=null, ipAttribution=, moduleDTOList=[ModuleDTO(moduleId=78cd11e688a3, moduleTitle=Neurology：急性缺血性卒中患者血脑屏障渗漏与小血管病变之间的关系如何？, moduleType=article, hrefUrl=https://www.medsci.cn/article/show_article.do?id=78cd11e688a3)], followStatus=false, userIsMember=false, type=1, lengthMark=0)] 梅斯话题小助手

血管病变

2020-05-29

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

JACC：糖尿病患者多支血管病变的长期存活率

2019-02-21

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Stroke：血脑屏障渗漏和微血管病变与脑-淀粉样血管病造成的脑损伤有关

2019-02-19

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Blood：血栓性微血管病变是BCR-ABL1酪氨酸激酶抑制剂帕纳替尼引发心血管毒性的原因之一

2019-02-09

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Hypertension：脑血管病变对高血压患者认知的影响

2019-01-06

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

合并心肌病和瓣膜病的冠脉微血管病变：降压、调脂、控糖有效

2018-12-22

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Arthritis Rheumatol：系统性硬化症中尺动脉闭塞与血管病变严重程度标志物

2018-12-18

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Circulation：微血管病变在心肌缺血起关键作用：分为4型，用4条标准可诊断

2018-10-13

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

J Infect Dis：水痘带状疱疹病毒血管病变研究进展J Infect Dis：水痘带状疱疹病毒血管病变研究进展

2018-09-29

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Hypertension：急性心肌梗死后高血压、微血管病变与预后

2018-07-19

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

EuroPCR2018丨多支血管病变患者血管成形术后即刻和延迟血运重建的结局

2018-05-28

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

【收藏】23种肾血管病变的影像学表现汇总

2018-05-17

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

合并多支血管病变高危心梗患者：抗血小板治疗也需更强、更长

2018-05-05

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Stroke：2型糖尿病对脑小血管病变的影响！

2018-04-27

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

基层糖尿病微血管病变筛查与防治专家共识

2018-03-17

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

冠心病三支血管病变伴左心室憩室超声表现1例

2018-02-23

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

J INTERN MED：CAIDE痴呆风险评分与老年痴呆症和脑血管病变有关！

2018-01-29

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

A J Resp Crit Care Med：警惕：常用戒烟药可能增加心血管病变的几率

2017-12-22

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

先心病中较常见的外周血管病变一例

2017-12-08

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Stroke：中年时全身炎症与老年白质完整性与脑小血管病变有何关系？

2017-11-05

124987c6m36暂无昵称 (审核中...)

前往app查看评论内容

#血管病变#

Neurology：急性缺血性卒中患者血脑屏障渗漏与小血管病变之间的关系如何？

2017-10-28

科室
- - 订阅+
  - 更多科室
工具
服务