Author contribution:
Study concept and design: Lechien, Ducarme, Chiesa, Saussez, De Rui, Vaira.
Acquisition, analysis, or interpretation of data : Lechien, Saussez, Khalife, Place, Ducarme, Machayekhi, de Terwangne.
Drafting of the manuscript: Lechien, Saussez, Journe, Marchant.
Critical revision of the manuscript for important intellectual content: Saussez, Chiesa, Journe, De Riu, Vaira, Marchant.
Funding : FRMH Funding.
Competing interests : None. Sponsorships: None. Funding source: None.