Teaching sigmoidoscopy to primary care physicians: a controlled study of continuing medical education.
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J. LoGerfo | E. Shulenberger | J. T. Ylvisaker | H. Kirz | D. Perera | LoGerfo Jp | Perera Dr | Kirz Hl | Ylvisaker Jt
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J. LoGerfo | E. Shulenberger | J. T. Ylvisaker | H. Kirz | D. Perera | LoGerfo Jp | Perera Dr | Kirz Hl | Ylvisaker Jt