C. Wigfall, M. Ganbat, J. Badarch, D. Warburton, and W. D. Crano, “Implementing Attitudes Measurement to Influence Winter Air Pollution Mask Wearing by Pregnant Women in Ulaanbaatar: A Pilot Study”, Cent. Asian j. Med. Sci., vol. 3, no. 3, pp. 269–281, Nov. 2017.