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Hovell M, Blumberg E, Gil-Trejo L, Vera A, Kelley N, Sipan C, Hofstetter CR, Marshall S, Berg J, Friedman L, Catanzaro A, Moser K.Hovell M, et al. Among authors: moser k.Soc Sci Med. 2003 Apr;56(8):1789-96. doi: 10.1016/s0277-9536(02)00176-4.Soc Sci Med. 2003.PMID: 12639595Clinical Trial.