1. UCD School of Medicine and Medical Science, University College Dublin, Dublin, Ireland (CMS)
2. Department of Physiology and Biophysics, Aarhus University, Aarhus, Denmark (AF)
3. Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland (AB)
4. Department of Physiology, School of Medicine, Western Gateway Building, University College Cork, Cork, Ireland (KDO)