Chest Medicine Associates. Physician Assistant/Nurse Practitioner - Part Time. South Portland, Maine. Chest Medicine Associates. is seeking a. Part Time Physician Assistant/ Nurse Practitioner. to be based in the South Portland office. Requirements. Must be licensed as a Nurse Practitioner (NP) or Physician Assistant (PA) in the State of Maine. Preferred candidates will have experience in office-based pulmonology, sleep medicine, and/or neurology...