[30]　仅比未接种的人低36%：‘The Ghost of Influenza Past and the Hunt for a Universal Vaccine', Nature, 8 Aug. 2018.
第二十一章　癌症：你每天都有5次得癌症的机会
[1] 白喉、天花和肺结核：Bourke, Fear, pp. 298-299.
[2] 癌症的早期历史是：Mukherjee, Emperor of All Maladies, pp. 44-45.
[3] 60岁以上的男性中有一半：Welch, Less Medicine, More Health, p. 71.
[4]　1961年，美国一项针对医生的调查：‘What to Tell Cancer Patients', Journal of the American Medical Association 175, no. 13 (1961).