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Ockene JK, Adams A, Pbert L, Luippold R, Hebert JR, Quirk M, Kalan K.Ockene JK, et al. Among authors: hebert jr.J Gen Intern Med. 1994 Jul;9(7):379-84. doi: 10.1007/BF02629517.J Gen Intern Med. 1994.PMID: 7931747Clinical Trial.