1 Department of Research, Netherlands Comprehensive Cancer Organisation, Utrecht, The Netherlands; Dutch Dietitian Oncology Group, Tilburg, The Netherlands. Electronic address: s.beijer@iknl.nl.
2 Dutch Dietitian Oncology Group, Tilburg, The Netherlands.
3 Research Group Healthy Ageing, Allied Health Care and Nursing, Hanze University of Applied Sciences, Groningen, The Netherlands; Department of Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands; Dutch Dietitian Oncology Group, Tilburg, The Netherlands.