Student DropoutsPatient DropoutsSchoolsLuxembourgPacific StatesEducational StatusWaiting ListsSchool NursingTreatment OutcomeSubstance-Related DisordersSocioeconomic FactorsSchools, MedicalSchool Health ServicesHealth StatusUnited StatesRandomized Controlled Trials as TopicSchools, DentalResearch DesignPatient ComplianceLiver TransplantationPatient SelectionWeight LossRisk FactorsQuestionnairesDouble-Blind MethodCarcinoma, Hepatocellular