Clarifications concerning contraceptive mobile app Pearl Index calculations

Affiliations

• ¹ NaturalCycles Nordic AB, Luntmakargatan 26, S-111 37 Stockholm, Sweden.
• ² Department of Clinical Sciences at Danderyd Hospital, Karolinska Institutet, S-182 88 Stockholm, Sweden; Department of Women's and Children's Health, Karolinska Institutet and Karolinska University Hospital, S-171 77 Stockholm, Sweden.
• ³ Department of Women's and Children's Health, Karolinska Institutet and Karolinska University Hospital, S-171 77 Stockholm, Sweden.
• ⁴ Office of Population Research, Princeton University, Princeton, NJ 08544, USA; The University of Edinburgh, Edinburgh EH8 9YL, Scotland, United Kingdom.
• ⁵ NaturalCycles Nordic AB, Luntmakargatan 26, S-111 37 Stockholm, Sweden. Electronic address: raoul.scherwitzl@naturalcycles.com.