Anxiety Disorders/diagnosis; Bipolar Disorder/diagnosis; Cross-Cultural Comparison; Depressive Disorder, Major/diagnosis; Students/psychology; Adolescent; Adult; Anxiety Disorders/drug therapy; Anxiety Disorders/epidemiology; Anxiety Disorders/genetics; Anxiety Disorders/psychology; Bipolar Disorder/drug therapy; Bipolar Disorder/epidemiology; Bipolar Disorder/genetics; Bipolar Disorder/psychology; California; Cross-Sectional Studies; Depressive Disorder, Major/drug therapy; Depressive Disorder, Major/epidemiology; Depressive Disorder, Major/genetics; Depressive Disorder, Major/psychology; Drug Utilization/statistics & numerical data; England; Female; Genetic Predisposition to Disease/epidemiology; Health Surveys; Humans; Internet; Male; Mass Screening; Personality Inventory/statistics & numerical data; Psychometrics; Psychotropic Drugs/therapeutic use; Students/statistics & numerical data; Universities