Perri Klass, M.D., and Eileen Costello, M.D., are paediatricians on the staff-of-Boston University School of Medicine. Both Harvard graduates who trained in paediatrics at Boston Medical Centre and Boston Children's Hospital, they have practiced paediatrics together at Dorchester House, a community health centre in Boston, for ten years. Klass writes frequently for The New York Times, and is a contributing editor at Parenting.
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