1. Independent Researcher, Badulla, Uva Province 90000, Sri Lanka
2. Independent Researcher, Villars-sur-Glâne 1752, Switzerland
3. Section of Epidemiology, University of Copenhagen, Copenhagen 1353, Denmark
4. Danish Meteorological Institute, Lyngbyvej 100, Copenhagen 2100, Denmark
5. National Centre for Climate Research, Danish Meteorological Institute, Lyngbyvej 100, Copenhagen 2100, Denmark