Hwang B-F, Lee YL, Jaakkola JJ. 2011. Air pollution and stillbirth: a population-based case–control study in Taiwan. Environ Health Perspect 119:1345–1349; http://dx.doi. org/10.1289/ehp.1003056 [Online 29 March 2011]. Strand L, Barnett A, Tong S. 2011. Methodological challenges when estimating the effects of season and seasonal exposures on birth outcomes. BMC Medical Research Methodology 11 (...