PRRT2 and benign familial infantile epilepsy: Heterozygous PRRT2 mutations cause paroxysmal kinesigenic dyskinesia (PKD), benign familial infantile epilepsy (BFIE), infantile convulsions and choreoathetosis (ICCA), hemiplegic migraine (HM), episodic ataxia (EA), paroxysmal torticollis, or a combination of them [1–14].