Increases in walking distance in patients with peripheral vascular disease treated with L-carnitine: a double-blind, cross-over study - Brevetti, G; Chiariello, M; Ferulano, G; Policicchio, A; Nevola, E; Rossini, A; Attisano, T; Ambrosio, G; Siliprandi, N; Angelini, C (Circulation, 1988)