[1] Newcastle Univ, Wolfson Unit Clin Pharmacol, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[2] Univ Birmingham, Dept Med, Birmingham B15 2TT, W Midlands, England
[3] Univ Autonoma Barcelona, CSU Vall Hebron, Inst Catala Farmacol, E-08193 Barcelona, Spain
[4] Huddinge Hosp, Karolinska Inst, Dept Clin Pharmacol, S-14186 Huddinge, Sweden