TY  - JOUR
A1  - Chao, F.
A1  - Gerland, P.
A1  - Cook, A.R.
A1  - Alkema, L.
T1  - Systematic assessment of the sex ratio at birth for all countries and estimation of national imbalances and regional reference levels
Y1  - 2019
DO  - 10.1073/pnas.1812593116
VL  - 116
IS  - 19

ER  -