Authors: Spencer D Dorn; David Wei; Joel F Farley; Nilay D Shah; Nicholas J Shaheen; Robert S Sandler; Michael D Kappelman Journal: Clin Gastroenterol Hepatol Date: 2011-12-07 Impact factor: 11.382
Authors: J Frank Wharam; Amy Johnson Graves; Fang Zhang; Stephen B Soumerai; Dennis Ross-Degnan; Bruce E Landon Journal: J Gen Intern Med Date: 2012-04-29 Impact factor: 5.128