1. Department of Basic Medical Sciences; Universitat de Lleida-IRBLLEIDA; Lleida 25198 Spain
2. Health Services Research Network in Chronic Diseases (REDISSEC); Spain
3. Erasmus Medical Center; Department of Biostatistics; 3000 CA Rotterdam The Netherlands
4. Department of Statistics and Operational Research; Universitat de València; Burjassot 46100 Spain
5. Critical Care Center, Parc Taulí University Hospital, Institut d'Investigació i Innovació Parc Taulí (I3PT); Universitat Autònoma de Barcelona; Sabadell Spain
6. CIBER Enfermedades Respiratorias; ISCIII; Madrid Spain
7. Asynchronies in the ICU Group (ASYNICU); Spain