%0 Journal Article %T Association of ERAP1, IL23R and PTGER4 Polymorphisms with Radiographic Severity of Ankylosing Spondylitis %A Ali Ugur Unal %A Can Erzik %A Fatih Eren %A Gulsen Ozen %A Haner Direskeneli %A Nevsun Inanc %A Pamir Atagunduz %A Rabia Deniz %A Sibel Zehra Aydin %A Sule Yavuz %J Archive of "The Open Rheumatology Journal". %D 2017 %R 10.2174/1874312901711010001 %X Radiographic severity of ankylosing spondylitis (AS) shows such great variance that some patients never develop syndesmophytes throughout the entire disease span, whereas some develop bamboo spine relatively early %K Ankylosing spondylitis %K radiographic severity %K ERAP1 %K IL23R %K PTGER4 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5366379/