Paul C. Billings, PhD Paul C. Billings, PhD, is a faculty member of the Biomedical Research Program in Pediatric Orthopaedics at Children's Hospital of Philadelphia. Locations: Main Campus Appointments and Referrals: 1-800-TRY-CHOP (1-800-879-2467) Education and Training Undergraduate DegreeMS in Cell Biology — University of Minnesota, Minneapolis, MN Graduate DegreePhD in Cell Biology — University of Minnesota, Minneapolis, MN Titles and Academic Titles Senior Scientist, Biomedical Research Program in Pediatric Orthopaedics Departments and Services Division of Orthopaedics Research Interests The role of heparin sulfate proteoglycans, cytokines and growth factors in the growth and development of skeletal elements The pathophysiology of Hereditary Multiple Exostoses (HME) Patient Experience Ratings About the Patient Experience Rating System The Patient Experience Rating is an average of all responses to the care provider related questions shown below from our nationally-recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question. Responses are measured on a scale of 1 to 5 with 5 being the best score. The comments are submitted by patients and families and reflect their views and opinions. The comments are not endorsed by and do not reflect the views of Children’s Hospital of Philadelphia.