title: Masseter spasm in Williams syndrome.
authors.forename: A J
authors.initials: AJ
authors.lastname: Matthews
authors.forename: J M
authors.initials: JM
authors.lastname: Vernon
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008297:Male; D008406:Masseter Muscle; D013035:Spasm / Q000139:chemically induced*; D013390:Succinylcholine / Q000009:adverse effects*
chemical_list: D013390:Succinylcholine