Received: 7 February 2020
Accepted: 23 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: The primary study, from which the data was retrieved for the current analyses, was ethically approved by The Regional Ethical Review Board of Uppsala, Sweden, (number 2012/189). Participants provided written informed consent in the chief study, including the data collection, analyses and reporting of the 4Ps.
: Not applicable.
: The authors declare no conflict of interest. The 4Ps is available free of charge from the first author, licensed as non-commercial by means of Creative Commons.