The computation of the weighted average number of shares requires restatement of the shares. outstanding before the stock dividend or split. The additional shares outstanding as a result of a stock. dividend or split are assumed to have been outstanding since the beginning of the year.
While the causes of autism are complex, it is abundantly clear that it is not caused by bad parenting. Dr. Leo Kanner, the psychiatrist who first described autism as a unique condition in 1943, believed that it was caused by cold, unloving mothers.
Causes. Autism spectrum disorder has no single known cause. Given the complexity of the disorder, and the fact that symptoms and severity vary, there are probably many causes. Both genetics and environment may play a role. 1  Genetic problems. 2  Several different genes appear to be involved in autism spectrum disorder.