[1] Santa Cristina Univ Hosp, Madrid, Spain
[2] Biodonostia Res Inst, San Sebastian, Spain
[3] IDIVAL, HUM Valdecillas, Santander, Spain
[4] Puerta Hierro Hosp, Madrid, Spain
[5] Clin Valladolid Univ Hosp, Valladolid, Spain
[6] Costa Sol Hosp, Malaga, Spain
[7] General Valencia Hosp, Valencia, Spain
[8] Leon Univ Hosp, Leon, Spain
[9] San Cecilio Univ Hosp, Granada, Spain
[10] La Fe Univ Hosp, Valencia, Spain
[11] Univ Carlos III Madrid, Madrid, Spain
[12] Valme Univ Hosp, Seville, Spain
[13] CIBERehd, Seville, Spain
[14] San Pedro Alcantara Hosp, Caceres, Spain
[15] Burgos Univ Hosp, Burgos, Spain
[16] Virgen Victoria Univ Hosp, Malaga, Spain
[17] Meixoxeiro Hosp, Vigo, Spain
[18] Fdn Alcorcon Univ Hosp, Madrid, Spain
[19] Virgen Rocio Univ Hosp, Seville, Spain
[20] Albacete Univ Hosp, Albacete, Spain
[21] Juan Ramon Jimenez Univ Hosp, Huelva, Spain
[22] Ramon Cajal Univ Hosp, Madrid, Spain