Pallav Bhatnagar, Emily Barron-Casella, Christopher J. Bean, Jacqueline N. Milton, Clinton T. Baldwin, Martin H. Steinberg, Michael DeBaun, James F. Casella, Dan E. Arking
PLoS One. 2013; 8(9): e74193. Published online 2013 Sep 13. doi: 10.1371/journal.pone.0074193