Proper training of field personnel represents a critical aspect of quality control. Before conducting the study, ten Field Investigators (FI) were recruited from different universities based upon their previous experience regarding the field level data collection. It was noted that almost all of the FIs had already received training on the use of standardized protocols to ensure safe and ethical collection of data, and to ensure compatibility among different groups. Never-the-less, an extensive training program was organized mainly focused on the procedures of data collection and ethical issues. A proper procedure to manage the selected informants
was followed at all times. In addition, previous experience of the researcher’s was described concerning to the possible problems they would be faced and how to tackle the issue.