[1] Univ British Columbia, Fac Pharmaceut Sci, Vancouver, BC V6T 1Z3, Canada
[2] Univ Toronto, Fac Dent, Toronto, ON M5G 1G6, Canada
[3] Univ Aalborg, Ctr Sensory Motor Interact, Lab Expt Pain Res, DK-9220 Aalborg, Denmark
[4] Aarhus Univ, Sch Dent, Dept Clin Oral Physiol, DK-8000 Aarhus C, Denmark