Strong opioids are more often prescribed by physicians of the Northern European countries. In Spain transdermal analgesics are frequently used.

  Source: Physician interviews conducted by GFK Healthcare, March - May 2009
Focussing on severe chronic low back pain; you mentioned that you treat patients with severe pain due to severe chronic low back pain. Now think in your last 100 patients with this indication: How many of your patients did you treat with the following agents?