[7] 多纳威特，那就这样吧：Dormandy, Worst of Evils, p. 483.
[8] 但同样地……减轻疼痛：Nature Neuroscience, April 2008, p. 314.
[9] 只要有一个富有同情心和关爱的伴侣：Wolf, Body Quantum, p. vii.
[10]　疼痛的受试者就为之提供吗啡：Nature Neuroscience, April 2008, p. 314.
[11] 40%的美国成年人：Foreman, Nation in Pain, p. 3.
[12]　总的来说，受慢性疼痛影响的人：‘The Neuroscience of Pain', New Yorker, 2 July 2018.
[13] 听不见，也看不见：Daudet, In the Land of Pain, p. 15.
[14] 我们使用的药物……缓解了50%的疼痛：‘Name for Their Pain?.
[15]　据估计，1999—2014年间：Chemistry World, July 2017, p. 28; Economist, 28 Oct. 2017, p. 41; ‘Opioid Nation', New York Review of Books, 6 Dec. 2018.