In order to define the experts’ profile, the Fehring validation model expert rating system was used. This system consists of a criteria set with pre-defined values for each characteristic applied for identifying ‘an expert’. According to this rating system, the experts’ profile should include nurses with at least master’s degree in nursing and a defined area of clinical expertise. The system also recommends evidence of expertise beyond the master’s degree, with special knowledge demonstrated by conducting research on the diagnoses or relevant content, current clinical practice of at least 1 year duration in an area relevant to the diagnoses of interest and certification in an area of clinical practice relevant to that diagnoses (Fehring, 1994). For this research, to be classified as an expert, nurses had to have scored from 4 to 12 points, according to criteria presented in Table 1. Moreover, the criterion of current clinical practice was considered a critical characteristic to take part in the study and was not given points in the rating system.