%0 Journal Article %T Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles %A Elina Berglund Scherwitzl %A Jonathan R. Bull %A Joyce Harper %A Kristina Gemzell Danielsson %A Raoul Scherwitzl %A Simon P. Rowland %J Archive of "NPJ Digital Medicine". %D 2019 %R 10.1038/s41746-019-0152-7 %K Reproductive biology %K Preclinical research %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6710244/