1. March of Dimes: Prematurity, born too soon, too small: Perinatal epidemiology research initiative,1998
2. Developmental outcomes;Bennett,1999
3. Cognitive and motor outcomes of cocaine-exposed infants;Singer;JAMA,2002
4. Effects of perinatal pain and stress;Anand;Prog Brain Res,2000
5. Clinical importance of pain and stress in preterm neonates;Anand;Biol Neonate,1998