TY  - JOUR
A1  - Basso, O.
A1  - Olsen, J.
A1  - Christensen, K.
T1  - A study of environmental, social and paternal factors in preterm delivery using sibs and half sibs. A population-based study in Denmark
Y1  - 1999
DO  - 10.1136/jech.53.1.20
JF  - Journal of Epidemiology and Community Health
VL  - 53
IS  - 1
SP  - 20
EP  - -23

ER  -