| web | https://www.bmj.com/content/368/bmj.l6669?fbclid=IwAR3dec5ZQxOykYZuiGfUuAftqfRmy2Fd4hVQjVCTfTUqAwQ5IiZwIqORjns |
| author | Yanping Li, Josje Schoufour |
| publication | BMJ |
| date | 2020-01-08 |
| web | Yanping Li, Josje Schoufour | BMJ | 2020-01-08 |
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