- Correspondence to Prof. Klea Katsouyanni, Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School 75, Mikras Asias street, 115 27 Athens, Greece;
- Received 4 November 2016
- Revised 10 April 2017
- Accepted 20 April 2017
- Published online 13 June 2017.
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