We aim to recruit a total of 200 subjects in the four different arms of the study. First arm: 50 adolescents admitted to CAPE because of potentially lethal suicidal behavior. This group consists of patients whose suicidal behavior could have ended their lives or significantly compromised their health in the absence of timely interception or intervention. We use this cohort as a proxy for "would be" completers. Second arm: 50 adolescents admitted to CAPE because of non-lethal suicidal behavior. This group includes patients who are admitted because of suicidal ideation without any attempt, or suicidal behaviors that would not have ended their lives or caused significant compromise in their health. Third arm: 50 adolescents admitted to CAPE due to mental health crises other than suicidal behavior. Fourth arm: 50 adolescents admitted to BCCH for reasons not related to mental health.