1. Department of Obstetrics and Gynecology, Hospital Eisenhüttenstadt, Friedrich-Engels-Str. 39, 15890 Eisenhüttenstadt, Germany
2. CEGPA, Av. Guardia Civil 135, San Borja, Lima, Peru
3. MIC Clinic Berlin, Kurstr. 11, 14129 Berlin, Germany
4. Department of Obstetrics and Gynecology, Pius Hospital, Georgstr. 12, 26121 Oldenburg, Germany