Chronic Spinal and Oral Morphine-Induced Neuroendocrine and Metabolic Changes in Noncancer Pain Patients - Valverde-Filho, João; Cunha Neto, Malebranche Berardo Carneiro da; Fonoff, Erich Talamoni; Meirelles, Eduardo de Souza; Teixeira, Manoel Jacobsen (Pain medicine, 2015)