1. Department of Gynecology and obstetrics Riga Stradiņš University Riga Latvia
2. Riga Maternity Hospital Riga Latvia
3. Obstetrics and Gynecology Ospedale Regionale di Bellinzona e Valli Bellinzona Switzerland
4. Independent Researcher Vacallo Switzerland
5. Department of Surgery Riga East Clinical University Hospital Riga Latvia