1 Department of Orthopaedic Surgery, Leiden University Medical Center, Centre for Bone Quality, Potzone J11R, Postbus 9600, 2300 RD, Leiden, The Netherlands. b.c.j.majoor@lumc.nl.
2 Department of Orthopaedic Surgery, Leiden University Medical Center, Centre for Bone Quality, Potzone J11R, Postbus 9600, 2300 RD, Leiden, The Netherlands.
3 Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Centre for Bone Quality, Leiden, The Netherlands.