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Dyfyniad Arddull ChicagoBerkow, Robert, Mark H. Beers, and Andrew J. Fletcher. The Merck Manual of Diagnosis and Therapy. Rahway, N. J: Merck Research laboratories, 1996.
Dyfyniad MLABerkow, Robert, et al. The Merck Manual of Diagnosis and Therapy. Merck Research laboratories, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.