1. Center for Clinical Epidemiology, Odense University Hospital, and Institute for Clinical Research, University of Southern Denmark; Odense Denmark
2. Herley University Hospital and Institute for Clinical Medicine, University of Copenhagen; Copenhagen Denmark
3. Hans Christian Andersen Children's Hospital, Odense University Hospital, and Research Unit of Paediatrics; Odense Denmark
4. Hospital Lillebaelt, Kolding, Denmark; and University of Southern Denmark; Odense Denmark