TY - JOUR AU - Cheng, T; Zhang, G TI - Worldwide research productivity in the field of rheumatology from 1996 to 2010: a bibliometric analysis JO - Rheumatology (Oxford) IS - 09 VL - 52 PY - 2013 DO - 10.1093/rheumatology/ket008 L3 - PubMed-ID: 23502075 SP - 1630 EP - 1634 ER -