Randomized Clinical Trial of Supplementing Brief Psychotherapy With a Mobile App

4x/day brief smartphone-based EMA surveys assessing negative emotions and STBs

TAU (or usual care) during hospitalization and the 28-day post-discharge period

(1) Three brief treatment sessions delivering core cognitive behavioral therapy (CBT) skills (mindful emotion awareness, cognitive flexibility, and changing emotional behaviors) (during hospitalization), (2) a discretionary booster session to reinforce treatment session content (that may be offered after discharge via either phone or telehealth), and (3) ecological momentary intervention (EMI) prompts to engage in guided skills practice exercises via smartphone