“…For example, we know that there are strong socio-cultural influences in some settings (not only in LLMICs) on the gender balance of offspring, and that this can have profound effects on women's propensity to develop PND (Ahmad & Khan, 2005;Xie et al, 2007). Finally, we know that there are many studies from upper middle income countries that might have relevance for understanding the relationships between PND and poverty, but that were excluded on the basis of our geographic limitations, for example, (Avan et al, 2010;Beard et al, 2005;Cooper et al, 2009;Cooper et al, 1999;Danaci et al, 2002;Ramchandani et al, 2009;Tomlinson et al, 2004).…”