 Sampling and randomization
RECRUITMENT
 The process of screening, recruitment, and randomization (group allocation) of participants was performed by a researcher who was not involved in the intervention or outcome assessment. Eligible participants (n = 80) were randomized in a 1:1 allocation ratio to one of the two intervention groups (experimental or control) using a computer-generated randomization table. The allocation concealment was achieved using a sealed opaque envelope describing the treatment group. All participants had to sign an informed consent form after receiving verbal and written information on the study protocol.