Valle, Juan, Wasan, Harpreet, Palmer, Daniel H., Cunningham, David, Anthoney, Alan, Maraveyas, Anthony, Madhusudan, Srinivasan, Iveson, Tim, Hughes, Sharon, Pereira, Stephen P., Roughton, Michael, Bridgewater, John, "Cisplatin plus gemcitabine versus gemcitabine for biliary tract cancer", New England journal of medicine, 2010