In the above article [1], the last funding acknowledgment “[…] and in part by the Research Centre Instituto de Telecomunicações under Grant UID/EEA/50008/2013.” is incorrect and outdated. The correct acknowledgment is “[…] and in part by FCT/MCTES through national funds and when applicable co-funded EU funds under the project UIDB/50008/ 2020-UIDP/50008/2020.”