@book{49245,
	author = {Hosmer, David W. and Lemeshow, Stanley.},
	title = {Applied survival analysis :},
	publisher = {Wiley-Interscience,},
	year = {c2008},
	address = {Hoboken ,NJ :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0826/2007035523-b.html}
}