Mammographic density and ageing: A collaborative pooled analysis of cross-sectional data from 22 countries worldwide ‌ Burton, A., Maskarinec, G., Perez-Gomez, B., Vachon, C., Miao, H., Lajous, M., López-Ridaura, R., Rice, M., Pereira, A., Garmendia, M.L., Tamimi, R.M., Bertrand, K., Kwong, A., Ursin, G., Lee, E., Qureshi, S.A., Ma, H., Vinnicombe, S., Moss, S., Allen, S., Ndumia, R., Vinayak, S., Teo, S.H., Mariapun, S., Fadzli, F., Peplonska, B., Bukowska, A., Nagata, C., Stone, J., Hopper, J., Giles, G., Ozmen, V., Aribal, M.E., Schüz, J., Van Gils, C.H., Wanders, J.O.P., Sirous, R., Sirous, M., Hipwell, J., Kim, J., Lee, J.W., Dickens, C., Hartman, M., Chia, K.S., Scott, C., Chiarelli, A.M., Linton, L., Pollan, M., Flugelman, A.A., Salem, D., Kamal, R., Boyd, N., dos-Santos-Silva, I., McCormack, V.