1 Inserm CIC 1431, University Hospital of Besançon, Besançon, France.
2 Inserm U1018, High-Dimensional Biostatistics for Drug Safety and Genomics, CESP, Villejuif, France.
3 Department of Public and Occupational Health, Expertise Center for Palliative Care, Amsterdam University Medical Center, Amsterdam Public Health Research Institute, Vrije Universiteit, Amsterdam, the Netherlands.