Hans-Rudolf Weiss1
, Shay Bess2
, Man Sang Wong3
, Vikas Patel4
, Deborah Goodall5
and Evalina Burger4 
1
Asklepios Katharina Schroth Spinal Deformities Rehabilitation Center, D-55566 Bad Sobernheim, Germany
2
Colorado Spine and Scoliosis Institute, Lonetree, CO, 80124, USA
3
Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong, PR China
4
Departmet of Orthopedics, University of Colorado School of Medicine, Denver, CO, USA
5
Rehabilitation services, Ealing Hospital, Uxbridge Road, Southall, London, UB1 3HW, UK