TY - JOUR A1 - Faurie, C. A1 - Russell, A.F. A1 - Lummaa, V. T1 - Middleborns disadvantaged? Testing birth-order effects on fitness in pre-industrial Finns Y1 - 2009 DO - 10.1371/journal.pone.0005680 JF - PLoS ONE VL - 4 IS - 5 ER -