5 Centre for Research in Environmental Epidemiology (CREAL), Universitat Pompeu Fabra (UPF), Barcelona, Spain CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain.
6 Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA Pulmonary and Critical Care Medicine Division, Baystate Medical Center, Tufts University School of Medicine, Springfield, Massachusetts, USA.
7 Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
8 LungenClinic Grosshansdorf, Grosshansdorf, Germany Pulmonary Research Institute, Airway Research Center North (ARCN), German Center for Lung Research, Grosshansdorf, Germany.
9 Faculty of Medicine and Life Sciences, Rehabilitation Research Centre, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium Department of Research & Education, CIRO+ Center of Expertise for Chronic Organ Failure, Horn, The Netherlands.