- Correspondence to Professor Henry de Vries, Public Health Service of Amsterdam, Cluster of Infectious Diseases, STI Outpatient Clinic, Weesperplein 1, Amsterdam 1018 WZ, The Netherlands;
- Received November 6, 2014
- Revised March 10, 2015
- Accepted March 17, 2015
- First published April 8, 2015.
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