title: Visual vignette.
authors.affiliation: Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
authors.forename: Preeyaporn
authors.initials: P
authors.lastname: Vitheesamrantham
authors.affiliation: Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
authors.forename: Thiti
authors.initials: T
authors.lastname: Snabboon
mesh_terms: D000293:Adolescent; D002872:Chromosome Deletion; D002892:Chromosomes, Human, Pair 22; D006801:Humans; D008297:Male