@techreport{NBERw14070,
 title = "Professional Partnerships and Matching in Obstetrics",
 author = "Andrew Epstein and Jonathan D. Ketcham and Sean Nicholson",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "14070",
 year = "2008",
 month = "June",
 URL = "http://www.nber.org/papers/w14070",
}