I have three questions: Do you know anything about YPD patients who have had hip replacement surgery? If so, why did the hip deteorate (trauma or hip deterioration)? How was rehabilitation -- i.e. was there post surgical dislocation. If so, was it due to muscle involvement from the PD? Do you have information about patients who have regained muscle control and skills after losing specific muscle group control from PD? How did they do it? Was there any diffference between men and women? Do you know anything about the first year of life in YPD's , relating to neonatal illnesses associated with nutritional difficiencies? I have been searching for information in these areas and would appreciate your help. Thanks.