Rav Shlomo Zalman Auerbach (Shemiras HaGuf v'HaNefesh): [Rav Shlomo Zalman Auerbach was asked why the view of Rav Sherira Gaon and the Rambam's son - that the medical and scientific knowledge of our Sages was that of their times - should be listed as a minority view? He replied:] "At the present I don't remember whether there was anyone who actually disagreed with their views or even whether anyone has the authority to disagree with them. However, rabbinic authorities typically explain disparities in medical and scientific understanding [between the views of our Sages and contemporary science] as the result of change in nature. They do not utilize at all the reason that medical knowledge has advanced from the time of our Sages. That is why I commented that this view should be classed as a minority view. Especially since concerning the laws of Shabbos, there are rabbinic authorities that permit violating the Shabbos [in certain circumstances that our Sages say are medically dangerous] despite the fact that contemporary doctors assert there is no danger at all.