Accidents--mortality Adolescent Adult Age Factors Cause of Death--trends Cohort Studies Comorbidity Data Collection--methods Drug Overdose--epidemiology Female HIV Infections--epidemiology Humans Life Style Male Methadone--therapeutic use Middle Aged Mortality--trends Netherlands--epidemiology Prevalence Sex Factors Smoking--mortality Statistics as Topic Substance Abuse, Intravenous--epidemiology Substance-Related Disorders--epidemiology