Low Serum Levels of Tricyclic Antidepressants in Amitriptyline- and Doxepin-Treated Inpatients with Depressive Syndromes are Associated with Nonresponse - Rao, Marie Luise; Deister, A; Laux, G; Staberock, Uta; Höflich, G; Möller, H -J (Pharmacopsychiatry, 1996)