Optimizing Compassion Training in Medical Trainees Using an Adjunct mHealth App: A Preliminary Single-Arm Feasibility and Acceptability Study - Jennalee S Wooldridge; Emily C Soriano; Gage Chu; Anaheed Shirazi; Desiree Shapiro; Marta Patterson; Hyun-Chung Kim; Matthew S Herbert (JMIR Formative Research)