@inbook{NBERc9967,
 Crossref = "NBERglae03-1",
 title = "HMO Penetration, Ownership Status, and the Rise of Hospital Advertising",
 author = "Jason Barro and Michael Chu",
 BookTitle = "The Governance of Not-for-Profit Organizations",
 Publisher = "University of Chicago Press",
 pages = "101-116",
 year = "2003",
 month = "January",
 URL = "http://www.nber.org/chapters/c9967",
}
@book{NBERglae03-1,
 title = "The Governance of Not-for-Profit Organizations",
 author = "Edward L. Glaeser",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2003",
 URL = "http://www.nber.org/books/glae03-1",
}