TY  - CONF 
AU  - Silva Fernández, Lucía
PY  - 2015
SN  - 0003-4967
UR  - http://hdl.handle.net/20.500.11940/1466
LA  - eng
TI  - Observational research designs
DO  - 10.1136/annrheumdis-2015-eular.6548
VL  - 74
ER  -