1. School of Geosciences University of Aberdeen, Aberdeen, UK.
2. Departamento de Geografía, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain.
3. Department of Geography, University of Manchester, Manchester, UK.
4. Laboratory of Ion Beam Physics, ETH Zürich, 8093 Zürich, Switzerland.
5. Department of Natural Sciences and Environmental Health, University of South-Eastern Norway, Bø, Norway.
6. Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126, Pisa, Italy.
7. Department of Earth Science, University of Bergen, P.O. Box 7800 5020 Bergen, Norway.
8. Department of Geology, Lund University, Sölvegatan 12, Lund, Sweden.