Magrey M, Yi E, Wolin D, Price M, Chirila C, Davenport E, Park Y. Understanding barriers in the pathway to diagnosis of ankylosing spondylitis: results from a US survey of 1690 physicians from 10 specialties. ACR Open Rheumatol. 2020 Oct;2(10):616-26. doi: 10.1002/acr2.11179
Mangel AW, Fehnel SE. End points in irritable bowel syndrome. Expert Rev Gastroenterol Hepatol. 2011 Jun 1;5(3):293-5.