APA style. APA Style is a writing style and format for academic documents such as journal articles and books. It is described in the style guide of the American Psychological Association (APA), which is titled the Publication Manual of the American Psychological Association.
A pain doctor, also called a pain specialist or pain management specialist, is a medical doctor (M.D.) or doctor of osteopathy (D.O.) who specializes in pain medicine.
Well, a rheumatologist is the doctor that often evaluates musculoskeletal medical conditions, and other diseases which can affect widespread muscles. A neurologist often evaluates and treats the same types of conditions. For pain issues, a physiatrist who specializes in pain management can be helpful with chronic muscle pain issues. Gastroparesis would be best evaluated by a gastroenterologist.