TY  - JOUR
A1  - Grech, V.
A1  - Savona-Ventura, C.
A1  - Vassallo-Agius, P.
T1  - Unexplained differences in sex ratios at birth in Europe and North America
Y1  - 2002
DO  - 10.1136/bmj.324.7344.1010
VL  - 324
IS  - 7344

ER  -