About the Authors
- Bruno Marchal, Anna Cavalli, Guy Kegels
- Department of Public Health, Institute of Tropical Medicine–Antwerp, Antwerp, Belgium
The authors have declared that no competing interests exist.
ICMJE criteria for authorship read and met: BM AC GK. Wrote the first draft of the paper: BM. Contributed to the writing of the paper: BM AC GK.