Schmitter, M., Cantineau, A., Rot, M. A. H., Lely, A., Verhage, T., Servaas, M. N., Riese, H. (2026). Study protocol for the development of a digital menstrual cycle diary for routine mental health and gynecological care: A human-centered design approach. PLoS ONE. https://doi.org/10.1371/journal.pone.0342586