Alaghband-Rad J, McKenna K, Gordon CT, Albus KE, Hamburger SD, Rumsey JM, Frazier JA, Lenane MC, Rapoport JL. Childhood-onset schizophrenia: the severity of premorbid course. J Am Acad Child Adolesc Psychiatry. 1995 Oct; 34(10):1273-83.