A data extraction tool developed for the purpose of this study utilizing the frameworks of Cooper (1984), and Stetler and
colleagues (1998) was used to ensure accurate and consistent retrieval of data. To ensure rigor, two reviewers tested
unitizing reliability [9, 14]. Intrarater reliability was verified by investigator re-analysis of selected data [15]. Developing a
clear and concise system for data collection greatly improves the reviewer’s capacity to ascertain reliable information from
all information sources [10]