Spong Catherine Y
Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, 6100 Executive Blvd, Room 4B03, MSC 7510, Bethesda, MD 20892, USA.
JAMA. 2013 Jun 19;309(23):2445-6. doi: 10.1001/jama.2013.6235.