数据来源:检索Medline,Embase,Cumulative Index to Nursing and Allied Health Literature、Cochrane Library、Institute for Scientific Information proceedings、Cambridge Scientific Abstracts、UMI Proquest、Trials Central...数据来源:检索Medline,Embase,Cumulative Index to Nursing and Allied Health Literature、Cochrane Library、Institute for Scientific Information proceedings、Cambridge Scientific Abstracts、UMI Proquest、Trials Central(www.trialscentral.org)和the metaregister of controlled trials(www.controlled—trials.coms)等数据库,并检索其相关参考文献。未设出版语言、出版年限及出版类型的限制。展开更多
文摘数据来源:检索Medline,Embase,Cumulative Index to Nursing and Allied Health Literature、Cochrane Library、Institute for Scientific Information proceedings、Cambridge Scientific Abstracts、UMI Proquest、Trials Central(www.trialscentral.org)和the metaregister of controlled trials(www.controlled—trials.coms)等数据库,并检索其相关参考文献。未设出版语言、出版年限及出版类型的限制。