Randomization and blinding
RECRUITMENT
Computer-generated randomization lists were prepared by a biostatistician not involved in the project. Participants were randomly allocated with 1:1:1 ratio within block sizes of 6. A research coordinator prepared concealed envelopes from the randomization list for four recruitment centers before recruitment (three orthopedic departments and one for primary care involving physical therapy clinics/advertisements). The self-reported data and objective outcomes assessors were blinded for group assignment.