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Facial Bradykinesia
JNNP 84:681-685, Bologna, M.,et al, 2013
Prader-Willi and Angelman Syndromes
Medicine 77:140-151, Cassidy,S.B.&Schwartz,S., 1998
Angelman Syndrome: Clinical Profile
J Child Neurol 7:270-280, Zori,R.T.,et al, 1992