Protocol to implement and evaluate a culturally secure, strength-based, equine-assisted learning program, "Yawardani Jan-ga" (horses helping), to support the social and emotional wellbeing of Australian aboriginal children and young people - Juli Coffin; Sharmila Vaz; Cheryl Kickett-Tucker; Helen Milroy; Craig Olsson; Meg Kirby; Lesley Nelson; Rob McPhee; Donna Cross (PLoS ONE)