E. Vettoratoand S. Bacco
In the introduction to the above paper (Vetterato & Bacco 2011) it is stated “Butorphanol is predominantly a μ-receptor agonist…”.
This should have read “a k-receptor agonist”.
On page 429, it is stated “However, when the present study was planned CPSS was not routinely used in our institution”.
The ‘not’ is a mistake. CPSS was routinely used.