    Sentence 1: Adolescent specialist Dr  Michael Cohen , who worked on the study  , said doctors had treated eight-year-old  children with anorexia - and that he had  once treated a four-year-old boy .    Sentence 2: Adolescent specialist Dr.  Michael Cohen , who worked on the study  , said doctors had treated _8-year-old  children with anorexia _ aiid that he had  once treated a 4-year-old boy .