Authors: R M Pérez-Ayuso; J M Piqué; J Bosch; J Panés; A González; R Pérez; J Rigau; E Quintero; R Valderrama; J Viver Journal: Lancet Date: 1991-06-15 Impact factor: 79.321
Authors: D Barer; A Ogilvie; D Henry; M Dronfield; D Coggon; S French; S Ellis; M Atkinson; M Langman Journal: N Engl J Med Date: 1983-06-30 Impact factor: 91.245