Table 1: The review protocol.

BackgroundAn e-Health System is figured out in the present work as a relatively recent term denoting healthcare practice supported by electronic processes and communication. However, it can also coin different meanings: some people argue that it is exchanged with Health informatics with a broader definition covering electronic/digital processes in Health, while others use it in the narrower sense of healthcare practice by means of the Internet. ICT organizations must guarantee stakeholders that a set of Quality Characteristics such as Usability, Functionality, or Maintainability must also be covered.

Research questionsWhat are the most studied and most used Quality Characteristics of e-Health Systems?

StrategySources: Google Scholar, Scopus, Mendeley, Science Direct, ISI Web of Knowledge, ACM Digital Library, CiteSeerX, or the IEEE digital library.
Keywords: “Quality” AND “e-Health”, “Evaluation” AND “e-Health”, “Assessment” AND “e-Health”, “Technology” AND “Health”, or “Communication” AND “Health”.

Study selection criteriaAll kinds of articles (conferences and journal articles, patents, websites, conference proceedings, doctoral dissertations, Open Access material, and some others) related to the quality evaluation of e-Health Systems, published from 2006. Three search types of logical criterion in the search field: 
(i) Search Type 1: Title field,  
(ii) Search Type 2: Title field, Abstract field, and Keywords field,  
(iii) Search Type 3: All fields.

Study selection proceduresThe article contains any kind of evaluation or assessment about any e-Health Systems.

Data extraction strategyThe data extracted from each paper will be as follows:
Source (i.e., the conference or journal), year when the paper was published, classification of the paper (type and scope, research trends, or specific research question), topic area, author(s), summary of the paper, and quality score for the study.