1994h-048 1998b-843 2006a-541 2013a-107 alternativetreatment anatomy comparative complementarytherapies composition dietaryproteins digestion digestiveorgans digestivesystem digestivesystemdiseases diseases food foodanalysis foodtechnology gastrointestinalsystem gastrointestinaltract histology mammals metabolism nutrition nutritionalphysiologicalphenomena pathophysiology physiology qp145 therapy vertebrates wi102b274g2006 wi102d247p1982 wi102d57271994 wi102p5781981 wi102p5781987 wi102s844c1988 wi102s844cd1995 wi140 wi18j17c1994