- Correspondence to Dr Grethe Elholm, Department of Public Health, Section for Environment, Occupation and Health, Aarhus University, Bartholins Allé 2, build. 1260, 8000 Aarhus, Denmark;
- Received February 18, 2017
- Revised June 22, 2017
- Accepted July 11, 2017
- First published August 23, 2017.
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