    Sentence |: Adolescent specialist Dr  Michael Cohen , who worked on the study  , Said doctors had treated eight-year-old  chidren 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  chidren with anorexia _ and that he had  once treated a 4-year-old boy .