Hans Verstraelen, Sylvie Goetgeluk, Catherine Derom, Stijn Vansteelandt, Robert Derom, Els Goetghebeur et al
Verstraelen H, Goetgeluk S, Derom C, Vansteelandt S, Derom R, Goetghebeur E et al.
Preterm birth in twins after subfertility treatment: population based cohort study
BMJ 2005; 331 :1173
doi:10.1136/bmj.38625.685706.AE