[1] Univ Hosp Valladoid, Thorac Surg Serv, E-47005 Valladolid, Spain
[2] Univ Hosp Valladoid, Serv Pathol, E-47005 Valladolid, Spain
[3] Bellvitge Hosp, Barcelona, Spain
[4] Sagrado Corazon Hosp, Barcelona, Spain
[5] Reina Sofia Hosp, Cordoba, Spain
[6] Virgen Nieves Hosp, Granada, Spain
[7] Univ Hosp, Alicante, Spain
[8] Hosp Gen Gregorio Maranon, Madrid, Spain
[9] Virgen Pino Hosp, Las Palmas Gran Canaria, Spain
[10] Virgen Rocio Hosp, Seville, Spain
[11] Univ Gen Hosp, Valencia, Spain
[12] Hosp Badalona Germans Trias & Pujol, Barcelona, Spain
[13] Hosp Insular, Las Palmas Gran Canaria, Spain
[14] Virgen Arrixaca Hosp, Murcia, Spain