[1] UAM, Inst Invest Sanitaria Princesa IP, Inst Teofilo Hernando, Clin Pharmacol Serv,Hosp Univ Princesa, Madrid, Spain
[2] Hosp Univ Princesa, Inst Invest Sanitaria Princesa, Dermatol Serv, Madrid, Spain
[3] Inst Salud Carlos III, Ctr Invest Biomed Red Enfermedades Hepat & Digest, Madrid, Spain
[4] Hosp Univ Gregorio Maranon, Clin Biochem Serv, Madrid, Spain