https://www.theguardian.com/society/2016/dec/14/autism-linked-to-vitamin-d-deficiency-during-pregnancy-researchers-find?CMP=Share_AndroidApp_Email
http://www.theatlantic.com/magazine/archive/2013/07/how-long-can-you-wait-to-have-a-baby/309374/
https://www.theguardian.com/society/2016/dec/14/autism-linked-to-vitamin-d-deficiency-during-pregnancy-researchers-find?CMP=Share_AndroidApp_Email
http://www.theatlantic.com/magazine/archive/2013/07/how-long-can-you-wait-to-have-a-baby/309374/