Physicochemical or geochemical

• Molla, Y. B., Wardrop, N. A., Le Blond, J. S., Baxter, P. J., Newport, M. J., Atkinson, P. M., Davey, G., (2013), Modelling environmental factors correlated with podoconiosis: a geospatial study of non-filarial elephantiasis, International Journal of Health Geographics, 13, 24, 10.1186/1476-072X-13-24