1 Institute of Applied Health Sciences, School of Medicine and Dentistry, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK. Electronic address: cairns.smith@btinternet.com.
2 Chennai, India.
3 Department of Public health, Erasmus Medical Center, Rotterdam, Netherlands.
4 Saint Armou, France.
5 Global Health Institute, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
6 Ministry of Health, Brasília DF, Brazil.
7 Department of Control of Neglected Tropical Diseases, WHO, Geneva, Switzerland.