21.   The study appeared in the American Journal of Public Health.

22.   The study appeared in the journal Science.

23.   The study appears along with two separate reports on promising but very early-stage experimental approaches to treating the disease.

24.   The study appears in the Archives of Dermatology, a publication of the American Medical Association.

25.   The study appears in the British journal Nature Medicine.

26.   The study appears in the current issue of Science.

27.   The study appears in the current issue of The Journal of Sex Research.

28.   The study appears in the current Journal of the American Medical Association.

29.   The study appears in the Journal of the American Medical Association.

30.   The study appears in the March issue of the journal Archives of General Psychiatry.