- Correspondence to Professor Irina Guseva Canu, Institut universitaire romand de la Santé au Travail (IST), Route de la Corniche, 2 CH-1066 Epalinges-Lausanne, Suisse;
- Received 25 August 2017
- Revised 1 November 2017
- Accepted 3 November 2017
- Published online 4 December 2017.
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