Early diphtheria-tetanus-pertussis vaccination associated with higher female mortality and no difference in male mortality in a cohort of low birthweight children: an observational study within a randomised trial - Aaby, Peter; Ravn, Henrik; Roth, Adam; Rodrigues, Amabelia; Lisse, Ida Maria; Diness, Birgitte Rode; Lausch, Karen Rokkedal; Lund, Najaaraq; Rasmussen, Julie; Biering-Sorensen, Sofie; Whittle, Hilton; Benn, Christine Stabell; et al. (Archives of Disease in Childhood, 2012)