1. Department of Environmental Sciences University of Basel Basel Switzerland
2. Department of Geosciences University of Massachsuetts Amherst Amherst MA USA
3. Institute of Geological Sciences University of Bern Bern Switzerland
4. Institute of Global Environmental Change Xi'an Jiatong University Xi'an China
5. MLR Key Laboratory of Karst Dynamics Institute of Karst Geology CAGS Guilin China