. 18 may, 2018, 09:28 | author: denise dawson. january 2012 (21).. in a never-before-seen video posted by msnbc, bill gates says that president donald trump asked him the difference between hiv and hpv. .yet these drugs are not a "home run," says elizabeth loder, md, a professor of neurology at harvard medical school and chief of the division of headache at brigham & women's hospital..