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Dear Mark Hirsch, Imentioned your work to Ms. Betsy Butterworth PTA and leader of our Parkinson's Disease Exercise Class. She would like to write to you' I assure you that she is a most worthy person. Her address is Chestnut Hill Rehabilitation Hospital, 8601 Stenton Avenue,Wyndmoor,PA.19038. Thank you very much. Sam Kalkstein 17 Oct.1995