*
Corresponding authors
a
Department of Earth Science & Engineering, Imperial College, London SW7 2AZ, UK
b
Department of Earth Sciences, University of Oxford, Room 20.45, South Parks Road, Oxford OX1 3AN, UK
E-mail:
fiona.larner@earth.ox.ac.uk
Fax: +44 (0)1865 272072
Tel: +44 (0)1865 282117
c
Department of Clinical Biochemistry, Imperial College Hospitals NHS Trust, Charing Cross Hospital, London W6 8RF, UK
d
Department of Mineralogy, Natural History Museum London, UK
e
Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, Colney, UK
f
Department of Neurology, Imperial College Hospitals NHS Trust, Charing Cross Hospital, London W6 8RF, UK
g
Department of Neurosciences, Imperial College London, Charing Cross Hospital, London W6 8RF, UK