1. Department of Intensive Care; Copenhagen University Hospital, Rigshospitalet; Copenhagen Denmark
2. Department of Intensive Care; Nordsjaellands Hospital; Hillerød Denmark
3. Section of Biostatistics; University of Copenhagen; Copenhagen Denmark
4. Center for Statistical Science; Peking University; Haidian Qu China
5. Department of Nephrology; Copenhagen University Hospital, Rigshospitalet; Copenhagen Denmark