1 Department of Infectious Diseases, Hospital Universitari de Bellvitge, Institut Investigacions Biomèdiques de Bellvitge (IDIBELL), University of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.
2 Biostatistics Unit, IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
3 Department of Infectious Diseases, Hospital Clinic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain.