Interaction between omeprazole and tacrolimus in renal allograft recipients: A clinical-analytical study - Pascual, J.; Marcén, R.; Orea, O.E.; Navarro, M.; Alarcón, M.C.; Ocaña, J.; Villafruela, J.J.; Burgos, F.J.; Ortuño, J. (Transplantation Proceedings, 2005)