2.1. Participants and Study Design
RECRUITMENT
Twenty-five individuals with CNNP were recruited for this IRB-approved preliminary clinical trial. The recruitment process was performed through spreading IRB approved flyers in the university campus (April 2018–March 2019). This preliminary randomized control trial constitutes an amendment to a previously registered randomized clinical trial, denoted as IRCT2017091620787N2, which was registered in 2017. The protocol for the main study was published in 2019 [