- Correspondence to Professor Henry de Vries, Public Health Service of Amsterdam (GGD Amsterdam), Cluster of Infectious Diseases, STI Outpatient Clinic, Weesperplein 1, 1018 WZ Amsterdam, The Netherlands;
- Received December 24, 2013
- Revised April 1, 2014
- Accepted May 4, 2014
- First published May 23, 2014.
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