▁prior ▁to ▁initi ating ▁the ▁Main ▁Study . ▁The ▁V angu ard ▁Study ▁en rolled ▁about ▁ 5 , 0 0 0 ▁children ▁in ▁ 4 0 ▁count ies ▁across ▁the ▁United ▁States . ▁General ▁rec ruit ment ▁was ▁completed ▁in ▁July ▁ 2 0 1 3 . ▁ ▁On ▁December ▁ 1 2 , ▁ 2 0 1 4 , ▁the ▁National ▁Children ' s ▁Study ▁closed , ▁after ▁an ▁expert ▁review ▁committee ▁ad vised ▁the ▁N I H ▁Director ▁that ▁moving ▁forward ▁with ▁the ▁larger ▁Main ▁Study ▁would ▁not ▁be ▁the ▁best ▁way ▁to ▁add ▁to ▁the ▁understanding ▁of ▁how ▁environmental ▁and ▁gen etic ▁factors ▁influence ▁child ▁health ▁and ▁development . ▁ ▁The ▁N CS ▁will ▁not ▁collect ▁any ▁new ▁information ▁from ▁participants . ▁ ▁The ▁N I H ▁plans ▁to ▁make ▁data ▁already ▁collected ▁available ▁to ▁research ers ▁in ▁late ▁ 2 0 1 5 . ▁ ▁References ▁ ▁External ▁links ▁ ▁Philip ▁J . ▁Land rig an , ▁and ▁Dean ▁B . ▁Baker ▁The ▁National ▁Children ' s ▁Study ▁— ▁End ▁or ▁New ▁Begin ning ? ▁N ▁Eng l ▁J ▁Med ▁ 2 0 1 5 ; ▁ 3 7 2 : 1 4 8 6 - 1 4 8 7 ▁April ▁ 1 6 , ▁ 2 0 1 5 ▁DO I : ▁ 1 0 . 1 0 5 6 / NE J M p 1 5 0 0 2 7 6 ▁ ▁Category : Children ' s ▁health ▁in ▁the ▁United ▁States ▁Category : P ed