Biologic Treatment Registry Across Canada (BioTRAC): a multicentre, prospective, observational study of patients treated with infliximab for ankylosing spondylitis oleh Emmanouil Rampakakis, John S Sampalis, Susan Otawa, Proton Rahman, Michel Zummer, Andrew Chow, May Shawi, Majed Khraishi, Denis Choquette, William G Bensen, Saeed Shaikh, Maqbool Sheriff, Sanjay Dixit, Dalton Sholter, Eliofotisti Psaradellis, Vincent Letourneau, Allen J Lehman, François Nantel