Of the 513,058 workers in the initial sample, 71,382 (13.9 %) do not switch jobs during the estimation period.
The most important reason for failing to trace all eligible participants, we believe, was the inclusion of temporary migrant workers in the initial study, as such participants would not have remained in the village at the time of the follow-up study.
In addition, the first responders and the health care workers involved in the initial response were not wearing personal protective equipment (PPE).
For example, when workers involved in the initial manufacture of gasoline lead additives suffered severe lead poisoning and even deaths, the lead industry blamed the victims for failing to follow good work practices.
And not a single sex worker was quoted in the initial articles about the gang rapes.
When apprentices become more productive during the training programme, eventually reaching the same productivity level as that of skilled workers in the firm, the initial net-investments by firms can become net benefits.
"It's not a huge number when you consider that if all the health care workers who were eligible in the initial round chose to get vaccinated it could be 1,000 to 2,000 people," said Dr. Joshua Lipsman, the county health commissioner.
Eleven workers were presumed killed in the initial explosion.
Taking dozens of workers hostage, the raiders claimed to be acting in response to France's intervention in neighbouring Mali, where fellow jihadists had threatened an advance on the capital, Bamako.Several workers were killed and wounded in the initial attack, but hundreds escaped.
The acknowledgment that the missing workers may have been caught in the initial explosion would not have come as a surprise to some of the relatives of survivors, who heard detailed stories of the disaster in emotional phone conversations late Wednesday night.
