Department of Research and Development, CIRO, Horn, the Netherlands. Department of Health Services Research, CAPHRI, Faculty of Health Medicine and Life Sciences, Maastricht University, Maastricht, the Netherlands. Department of Respiratory Medicine, Maastricht University Medical Centre+ (MUMC+), Maastricht, the Netherlands. Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+ (MUMC+), Maastricht, The Netherlands. Department of Family Medicine, CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands. Department of Respiratory Medicine, Zuyderland, Sittard-Geleen, the Netherlands. Department of Respiratory Medicine, Zuyderland, Heerlen, the Netherlands. Reval Rehabilitation Research, Biomedical Research Institute, Faculty of Rehabilitation Sciences, Hasselt University, Diepenbeek, Belgium.