Trained field workers visited all contacts after 48 72 hours to measure the skin induration.
Collectors were in all cases trained field assistants of BCFS or in one case VR.
After this, trained field staff used structured questionnaires to interview the participants.
All registered deaths are followed up with a verbal Autopsy (VA) by well trained field staff.
Trained field workers carried out verbal autopsies on all deaths recorded during the trial.
Maturational status was assessed by well trained field workers stationed at the "skinfold measurements" station.
Trained field workers then obtained informed verbal consent from the participants.
JB provided technical advice, trained field workers and assisted in drafting the paper.
Trained field staff from Xi'an Jiaotong University Health Science Center conducted the questionnaire surveys and anthropometric measures.
Trained field personnel identified the species, sex, and age (when possible) of the bird on the basis of plumage (19 ).
Measurements and interviews of potential participants by specially trained field study teams (medical doctors, nurses, laboratory technicians).
