Scientific issues

Frank-Herrmann, Petra; Gnoth, Christian; Baur, Siegfried; Strowitzki, Thomas; Freundl, Günter:
Determination of the fertile window: Reproductive competence of women – European cycle databases, in: Gynecological Endocrinology (2005), Vol. 20, No. 6, p. 305-312.

Gnoth, Christian; Frank-Herrmann, Petra; Schmoll, A.; Godehardt, Erhard; Freundl, Günter:
Cycle characteristics after discontinuation of oral contraceptives, in: Gynecological Endocrinology (2002), Vol. 16, S. 307-317.

Gnoth, Christian; Bremme, Michael; Klemm, R.; Frank-Herrmann, Petra; Godehardt, Erhard; Freundl, Günter:
Research and quality control in natural family planning with relational database systems. Forschungsprojekt NFP der Heinrich-Heine-Universität Düsseldorf 1998, in: Advances in Contraception (1999), Vol. 15, No. 4, S. 375-380.

Jacobs, C.; Frank-Herrmann, Petra; Jenetzky, E.; Strowitzki, Thomas:
Self-observation of the fertile window in the menstrual cycle by the infertility patient: diagnostic relevance and spontaneous pregnancy rate, in: Human Reproduction (2006), Vol. 21, Supplement 1, Nr. 504, S. 194.