8Pocock SJ,Collier TJ,Dandreo KJ,et al.Issues in the reporting of epidemiological studies:a survey of recent practice[J].Brit Med J,2004,329(7 471):883.
9Wells G A,Shea B,O'connell D,et al.The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta-analyses[J].2000.Available from:http://www.ohri.ca/prms/clinical_epidemiology/oxford.asp.
10Von Elm E,Altman DG,Egger M,et al.The Strengthening the Reporting of Observational Studies in Epidemiology(STROBE) statement:guidelines for reporting observational studies[J].Prev Med,2007,45 (4):247-251.