Setting and Randomization
LBP
A total of 58 Dutch primary care physiotherapy practices with 122 physiotherapists were randomized at the practice level by an independent researcher according to a 1:1 allocation ratio using a computer-generated, a priori–created random sequence table. Half of the practices (29/58, 50%) were instructed to treat their patients with nonspecific LBP according to the stratified blended physiotherapy (e-Exercise LBP) protocol. The other half (29/58, 50%) treated their patients with face-to-face care following the recommendations of the guidelines for LBP of the Royal Dutch Society for Physiotherapy [