The timing accuracy of the 64-Hz sampling rate of the magnetometer data was guaranteed by using GPS receivers.
Nevertheless, a considerable effort was made to adequately deal with ethical considerations: for example, the anonymity of the respondents and their data was guaranteed by the use of codes, and a priori informed consent was obtained from all study participants.
The confidentiality of personal data is guaranteed by the fact that person-identifiable data will not be available to anyone outside the local healthcare team.
A privacy protocol has been developed in which confidentiality of data is guaranteed by using a unique research ID number for each respondent, which enables to identify individuals without using their names.
High quality data and reliable information was guaranteed by several steps: preparatory meetings, development of detailed manuals of operation, monitoring technical site visits to the centers, close monitoring of data collection and data entry, concurrent query management, checking for logical inconsistencies, and correction of database.
Therefore, anonymity of data was guaranteed in our study.
Confidentiality of the data was guaranteed.
All of the PEs in the system are synchronized after each iteration, so that the necessary data is guaranteed to have been received by the respective PEs.
Four, accurate data are guaranteed from healthcare utilisation databases of Lombardy, as documented by several quality checks.
The data quality was guaranteed by stringent monitoring.
Moreover, homogeneous data collection was guaranteed by the initial training followed by research assistants.
