@techreport{NBERw10122,
 title = "The Timing of Births: Is the Health of Infants Counter-Cyclical?",
 author = "Rajeev Dehejia and Adriana Lleras-Muney",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "10122",
 year = "2003",
 month = "November",
 URL = "http://www.nber.org/papers/w10122",
}