[1] Medina Campo Hosp, Dept Gen & Digest Surg, Valladolid, Spain
[2] Univ Seville, Univ Hosp Virgen Macarena, Dept Gen & Digest Surg, Seville, Spain
[3] Hosp Quironsalud Sagrado Corazon, Dept Gen & Digest Surg, Seville, Spain
[4] Medina Campo Hosp, Gen & Digest Surg Dept, Ctra Penaranda 24, Valladolid 47400, Spain