Measure of intervention fidelity (CNS workshop delivery)
Fidelity will be measured by recording all pre- and post-intervention group workshops (with consent obtained from participants), and 20% will be randomly selected (with a computer-generated random number sequence), ensuring two sessions per site. An independent person will rate these for adherence to the treatment manual. Some recordings may be used by the trial team to provide feedback to CNS team members to ensure adherence to the treatment model.