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Berg CJ, Bruce FC, Callaghan WM.Berg CJ, et al. Among authors: callaghan wm.J Am Med Womens Assoc (1972). 2002 Summer;57(3):173-4.J Am Med Womens Assoc (1972). 2002.PMID: 12146612
Geller SE, Cox SM, Callaghan WM, Berg CJ.Geller SE, et al. Among authors: callaghan wm.Womens Health Issues. 2006 Jul-Aug;16(4):176-88. doi: 10.1016/j.whi.2006.06.003.Womens Health Issues. 2006.PMID: 16920522Review.