1 “...Historians, philosophers, sociologists, and biologists explore the history of the idea...”

2 “... for modern vaccines and historians familiar with the stories about the ones developed in earlier centuries...”

3 “... interdisciplinary analyses, a valuable resource for economists, gerontologists, historians, political scientists...”

4 “..., anthropologists, social and cultural historians, and experts in ageing, gerontology, nursing and social work. ...”

5 “..., historians of medicine and philosophers of science and medicine...”

6 “...: it has happened all too often that innocent historians have been left in utter confusion by the careless...”

7 “...And even I can remember A day when historians left blanks in their writings, I mean for things...”