| web | http://www.bmj.com/content/349/bmj.g6015 | 
| author | Karl Michaƫlsson, Alicja Wolk | 
| publication | BMJ | 
| date | 2014-10-28 | 
| web | Candice Choi | Associated Press | 2015-01-26 | |
| web | Abby Phillip | Washington Post | 2014-10-31 | 
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