Child of Impaired Parents/psychology; Mental Disorders/enzymology; Parents/psychology; Psychology, Adolescent; Substance-Related Disorders/epidemiology; Adolescent; Adult; Child of Impaired Parents/statistics & numerical data; Comorbidity; Cross-Cultural Comparison; Delivery of Health Care/standards; Diagnosis, Dual (Psychiatry); Diagnostic and Statistical Manual of Mental Disorders; Fathers/psychology; Fathers/statistics & numerical data; Female; Humans; Male; Mental Disorders/diagnosis; Mental Disorders/therapy; Mothers/psychology; Mothers/statistics & numerical data; North America/epidemiology; Patient Acceptance of Health Care; Prevalence; Psychiatric Status Rating Scales/statistics & numerical data; Sex Distribution; Substance-Related Disorders/diagnosis; Substance-Related Disorders/therapy; Sweden/epidemiology; Urban Population/statistics & numerical data