1. Wageningen University and ISRIC - World Soil Information; Wageningen, the Netherlands
2. Biometris; Wageningen University and Research; Wageningen, the Netherlands
3. Section of Soil and Crop Sciences; Cornell University, Ithaca, USA and ISRIC - World Soil Information; Wageningen, the Netherlands
4. College of Environmental and Resource Sciences; Zhejiang University; Hangzhou, China