Tham khảo :
- Medscape 16.05.2017
- BMJ.Pub.Online 16 May 2017
"Old doctors may not die, but more of their patients do"
Social Sciences News, 17 May 2017
https://cosmosmagazine.com/social-sciences/old-doctors-may-not-die-but-more-of-their-patients-do
http://www.telegraph.co.uk/news/2017/05/16/patients-treated-older-doctors-likely-die-new-research-indicates/
