West R, Zhou X. Is nicotine replacement therapy for smoking cessation effective in the "real world"? Findings from a prospective multinational cohort study. Thorax. 2007 Nov 1;62(11):998-1002. doi: 10.1136/thx.2007.078758
Wagner JD, Anthony MS, Cline JM. Soy phytoestrogens: research on benefits and risks. Clin Obstet Gynecol. 2001 Dec;44(4):843-52.