Maternal age at child birth, birth order, and suicide at a young age: a sibling comparison.
Bjørngaard JH, Bjerkeset O, Vatten L, Janszky I, Gunnell D, Romundstad P. Maternal age at child birth, birth order, and suicide at a young age: a sibling comparison. Am J Epidemiol. 2013 Apr 01; 177(7):638-44.