Norwitz E R, Hoyte L P, Jenkins K J, van der Velde M E, Ratiu P, Rodriguez-Thompson D, Wilkins-Haug L, Tempany C M, Fishman S J
Department of Obstetrics, Gynecology, and Reproductive Biology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
N Engl J Med. 2000 Aug 10;343(6):399-402. doi: 10.1056/NEJM200008103430604.