VERTEX PHARMACEUTICALS INCORPORATED; CHARIFSON, Paul, S.; CLARK, Michael, P.; BANDARAGE, Upul, K.; BETHIEL, Randy, S.; BOYD, Michael, J.; DAVIES, Iona; DENG, Hongbo; DUFFY, John, P.; FARMER, Luc, J.; GAO, Huai; GU, Wenxin; KENNEDY, Joseph, M.; LEDFORD, Brian; LEDEBOER, Mark, W.; MALTAIS, Francois; PEROLA, Emanuele; WANG, Tiansheng Patent: WO2013/19828 A1, 2013