Britt (DiBenedetti) DM, Collins FL, Cohen LM. Cigarette smoking and chewing gum use among college students. J Appl Biobehav Res. 2007 Jun 4;4(2):85-90. doi: 10.1111/j.1751-9861.1999.tb00057.x
Burke GL, Anthony MS, Vitolins M. Dietary soy protein and lipids: a strategy for primary prevention of cardiovascular disease? Current opinion in endocrinology diabetes and obesity. 1996 Dec;3(6):508-13.