- Correspondence to Professor Mauro D’Amato, Unit of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, T2, Karolinska University Hospital, SE-17176 Stockholm, Sweden;
- Received December 12, 2017
- Revised December 28, 2017
- Accepted December 29, 2017
- First published January 13, 2018.
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