1. Department of Pathology, Section of Molecular Pathology, University Hospital Vrije Universiteit,1 and
2. Institute for Research in Extramural Medicine,2 Vrije Universiteit,
3. STD Clinic, Department of Dermatology, University Hospital,3 and
4. Regional Public Health Laboratory,4 Groningen, The Netherlands
5. Department of Obstetrics and Gynecology, OLVG Hospital,5 and
6. Municipal Health Service,6 Amsterdam, and