Investigating the Effects of a High-Load Resistance Training Program on Bone Health in Wheelchair Users (the BoneWheel Study): Protocol for a Randomized Controlled Trial - Linn Christin Risvang; Vegard Strøm; Jan-Willem van Dijk; Hannah Rice; Øyvind Sandbakk; Lars Peder Bovim; Julia Kathrin Baumgart; Marte Bentzen; Truls Raastad; Kristin L Jonvik (JMIR Research Protocols)