Evaluating frailty may complement APACHE II in estimating mortality in elderly patients admitted to the ICU after digestive surgery P. Ruiz de Gopegui Miguelena; M.T. Martínez Lamazares; L.M. Claraco Vega; M. Gurpegui Puente; I. González Almárcegui; P. Gutiérrez Ibañes; A. Carrillo López; C.M. Castiella García; J. Miguelena Hycka;

HLA genetic polymorphisms and prognosis of patients with COVID-19 L. Lorente; M.M. Martín; A. Franco; Y. Barrios; J.J. Cáceres; J. Solé-Violán; A. Perez; J.A. Marcos y Ramos; L. Ramos-Gómez; N. Ojeda; A. Jiménez;

Association between obesity and mortality in adult patients receiving invasive mechanical ventilation: A systematic review and meta-analysis P. Tocalini; A. Vicente; R.L. Amoza; C. García Reid; A.J. Cura; W.A. Tozzi; M. Villarruel; F. Esperón; M.A. Alí; M.N. Novo; S.A. Virgilio;