Depending on the project, some have success with cold-emailing PM&R program directors, PM&R program coordinators, PM&R fellowship program directors. It is hit or miss and many might just delete the email (or it could end up in the spam folder). Some organizations have sent out resident surveys in the past (AMSSM for sports, AAP for PM&R, AOCPMR for PM&R, PM&R Scholars). I am not sure the process, but it may be worth looking into those.