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Haynes RB, McKibbon KA, Walker CJ, Ryan N, Fitzgerald D, Ramsden MF.Haynes RB, et al. Among authors: walker cj.Ann Intern Med. 1990 Jan 1;112(1):78-84. doi: 10.7326/0003-4819-112-1-78.Ann Intern Med. 1990.PMID: 2403476
Haynes RB, Ramsden M, McKibbon KA, Walker CJ, Ryan NC.Haynes RB, et al. Among authors: walker cj.Acad Med. 1989 Apr;64(4):207-12. doi: 10.1097/00001888-198904000-00009.Acad Med. 1989.PMID: 2647092