Sarrar L, Ehrlich S, Merle JV, Pfeiffer E, Lehmkuhl U, Schneider N. Cognitive flexibility and Agouti-related protein in adolescent patients with anorexia nervosa. Psychoneuroendocrinology. 2011 Oct;36(9):1396–406. doi: 10.1016/j.psyneuen.2011.03.014. PMID: 21531082.