3. <TAB>Roles of the UDP personnel. The UDP Director performs the triage, makes the final decision, and signs the decision letters. The consultants are NIH clinical specialists from the Clinical Center departments and the ICs. A group of nurse practitioners and one physician s assistant communicate about medical issues with patients and referring physicians. Support personnel obtain missing articles, copy records, file them, send out letters of receipt, enter information in the Lab Matrix database, and answer phone calls.