Cytokines and the risk of preterm delivery in twin pregnancies. - Rode L; Klein K; Larsen H; Holmskov A; Andreasen KR; Uldbjerg N; Ramb J; Bødker B; Skibsted L; Sperling L; Hinterberger S; Krebs L; et al. (Obstetrics & Gynecology, 2012)