@article{Collaborative Group on Hormonal Factors in Breast Cancer2002,
author = {Collaborative Group on Hormonal Factors in Breast Cancer},
title= {Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50,302 women with breast cancer and 96,973 women without the disease},
year = {2002},
doi = {10.1016/S0140-6736(02)09454-0},
journal = {The Lancet},
volume = {360},
number = {9328},
pages = {187--195},
}