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Shea B, Moher D, Graham I, Pham B, Tugwell P.Shea B, et al. Among authors: tugwell p.Eval Health Prof. 2002 Mar;25(1):116-29. doi: 10.1177/0163278702025001008.Eval Health Prof. 2002.PMID: 11868441
Moher D, Pham B, Jones A, Cook DJ, Jadad AR, Moher M, Tugwell P, Klassen TP.Moher D, et al. Among authors: tugwell p.Lancet. 1998 Aug 22;352(9128):609-13. doi: 10.1016/S0140-6736(98)01085-X.Lancet. 1998.PMID: 9746022
Brehaut JC, Santesso N, O'Connor AM, Lott A, Lindgaard G, Syrowatka A, Graham ID, Tugwell PS.Brehaut JC, et al.J Med Internet Res. 2011 Jan 18;13(1):e5. doi: 10.2196/jmir.1532.J Med Internet Res. 2011.PMID: 21247863Free PMC article.