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Prader-Willi syndrome

is a kind of:

Although technically not a mental disorder (Physical manifestations dominate this genetically transmitted developmental disorder.), Prader-Willi syndrome is included here because of its behavioral manifestations which can include compulsive skin picking, feeding problems in infancy, temper outbursts, perseveration, obsessive-compulsive symptoms, lying, stealing, stubbornness, and sleep disturbances including sleep apnea.