- Correspondence to L W L Spauwen, Department of Sexual Health, Infectious Diseases and Environmental Health, South Limburg Public Health Service, PO Box 2022, 6160 HA Geleen, The Netherlands;
- Received April 4, 2014
- Revised July 22, 2014
- Accepted August 13, 2014
- First published October 23, 2014.
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