*Limitations*

In relation to the sample universe, there was an overall response rate of just 24.7% among all physicians, nurses and dentists from the counties of Bages, Moianès and Berguedà, regardless of whether they used a telemedicine service or not. However, the 108 participants can be seen as a representative sample of the professionals who use telemedicine in this area, since it is not expected that many more professionals use it, although the exact number has not been recorded. Considering that nurses make up almost half of the sample, the socio-demographic profile of the participants is quite similar to that shown by analyses of primary care professionals in Catalonia [32].

Using a web-based survey implies a possible bias in obtaining answers from those with better technology management. It is also possible, for example, that more people in favor of telemedicine services responded to the survey. Professionals who had negative experiences may have not responded

to the questionnaire. Moreover, because the data are based on self-reported measurements, they are potentially highly correlated. It should also be borne in mind that this survey was conducted in a semi-rural context, where previous studies have shown that, in general, there is a greater acceptance of telemedicine [18,19]. In the future, it would be interesting to see if the same results are reproduced in an urban context.

We are aware that the simplicity of the eight questions questionnaire might imply that the tool loses some capacity to capture specific insights. However, the questionnaire was specifically designed to be simple to use and was validated in a previously published study, showing a high reliability index [30].

We performed correlations using ordinal qualitative variables, as we thought that it could help us to understand relations among the factors we were dealing with, such as satisfaction, di fficulties and future use. We also used a multivariate linear regression model as a qualitative exercise to propose possible relations between variables, and also in order to propose the key questions to measure the success of teledermatology. These results should not be interpreted as a basis on which to draw firm conclusions or certainties, or to quantify relations, but rather to observe possible relations and to find possible indicators of success. Finally, it should be mentioned that, in future studies, these results should be compared with other perspectives, such as users/patients or healthcare administrators.
