Internal validity and the risk of bias: a case for a comprehensive review.
Vance W
VW
Berger
D006331:Heart Diseases / Q000401:mortality* / Q000517:prevention & control*; D006801:Humans; D007431:Intraoperative Complications / Q000401:mortality* / Q000517:prevention & control*; D015201:Meta-Analysis as Topic; D019990:Perioperative Care / Q000379:methods*; D059035:Perioperative Period / Q000401:mortality*; D011183:Postoperative Complications / Q000401:mortality* / Q000517:prevention & control*