Julia Hippisley-Cox, Carol Coupland, Richard Logan
Hippisley-Cox J, Coupland C, Logan R.
Risk of adverse gastrointestinal outcomes in patients taking cyclo-oxygenase-2 inhibitors or conventional non-steroidal anti-inflammatory drugs: population based nested case-control analysis
BMJ 2005; 331 :1310
doi:10.1136/bmj.331.7528.1310