L-carnitine supplementation in patients with advanced cancer and carnitine deficiency: a double-blind, placebo-controlled study - Cruciani, R A; Dvorkin, E; Homel, P; Culliney, B; Malamud, S; Lapin, J; Portenoy, R K; Esteban-Cruciani, N (J Pain Symptom Manage, 2009)