Limitations and Strengths
The study has limitations. More than 30 coworkers
collected the data in this study, which could have led to
poor quality of the data compared with data collected by
a smaller number of coworkers. We were aware of this
possible limitation before the study and, therefore, all
the coworkers were trained and we had telephone contact
with them throughout the data collection period. A
written manual on how to collect data was used