Analysis populations
The analysis set will consist of all dyads who were randomised, with all dyads reported and analysed according to their randomised study arm. The safety population will consist of all dyads receiving at least one study treatment (including SC alone), with all dyads reported and analysed according to the intervention received. Participants in the MI or RI arms will be considered as having received the study treatment if the dyad attended at least one training session and that all training components were delivered (meeting the fidelity criteria).