| 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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