[1] Univ Nottingham, Sch Life Sci, Sch Med, Nottingham NG7 2UH, England
[2] NIEHS, NIH, Dept Hlth & Human Serv, Res Triangle Pk, NC 27709 USA
[3] Univ Bristol, Sch Physiol Pharmacol & Neurosci, Bristol BS8 1TD, Avon, England
[4] Univ Dundee, Ninewells Hosp, Med Educ Inst, Neurosci Div, Dundee DD1 9SY, Scotland
[5] Univ Dundee, Sch Med, Dundee DD1 9SY, Scotland
[6] Univ Edinburgh, Ctr Integrat Physiol, Edinburgh EH8 9XD, Midlothian, Scotland