Arsenic modifies the effect of folic acid in spina bifida prevention, a large hospital-based case-control study in Bangladesh oleh Chih-Fu Wei, Sudipta Kumer Mukherjee, Sheikh Muhammad Ekramullah, D. M. Arman, Md Joynul Islam, Mubinul Azim, Asifur Rahman, Md Nafaur Rahman, Md Ziauddin, Gwen Tindula, Hafiza Sultana Suchanda, Diana F. Gomberg, Marc G. Weisskopf, Liming Liang, Benjamin C. Warf, David C. Christiani, Maitreyi Mazumdar