Emigration and Immigration; Ethnicity/psychology; Mental Disorders/ethnology; Urban Population/statistics & numerical data; Anxiety Disorders/diagnosis; Anxiety Disorders/epidemiology; Anxiety Disorders/ethnology; Anxiety, Separation/diagnosis; Anxiety, Separation/epidemiology; Anxiety, Separation/ethnology; Attention Deficit Disorder with Hyperactivity/diagnosis; Attention Deficit Disorder with Hyperactivity/epidemiology; Attention Deficit Disorder with Hyperactivity/ethnology; Attention Deficit and Disruptive Behavior Disorders/diagnosis; Attention Deficit and Disruptive Behavior Disorders/epidemiology; Attention Deficit and Disruptive Behavior Disorders/ethnology; Bipolar Disorder/diagnosis; Bipolar Disorder/epidemiology; Bipolar Disorder/ethnology; Child; Child Behavior Disorders/diagnosis; Child Behavior Disorders/epidemiology; Child Behavior Disorders/ethnology; Conduct Disorder/diagnosis; Conduct Disorder/epidemiology; Conduct Disorder/ethnology; Cross-Cultural Comparison; Cross-Sectional Studies; Depressive Disorder, Major/diagnosis; Depressive Disorder, Major/epidemiology; Depressive Disorder, Major/ethnology; Emigration and Immigration/statistics & numerical data; Ethnicity/statistics & numerical data; Female; Humans; Internal-External Control; Male; Mass Screening; Mental Disorders/diagnosis; Mental Disorders/epidemiology; Morocco/ethnology; Netherlands; Personality Assessment; Socioeconomic Factors; Stress Disorders, Post-Traumatic/diagnosis; Stress Disorders, Post-Traumatic/epidemiology; Stress Disorders, Post-Traumatic/ethnology; Suriname/ethnology; Turkey/ethnology