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A variant of the area sampling approach, in which clusters are operationally defined as 24 wedge-shaped radial sectors layered on top of a Google Earth image of Berekuso, was adapted for the study [Figure 1].
The area sampling fraction can then be calculated from this information.
An area sampling program to monitor MBOCA levels in the work environment of this MBOCA manufacturing factory was initiated by the Taiwan Institute of Occupational Safety and Health (IOSH), Council of Labor Affairs (IOSH 2003a).