“…Thus, EtS has been pointed out as the best biomarker to estimate alcohol consumption by means of WBE. WBE was first applied to estimate alcohol consumption in 2011 in Oslo (Norway) (Reid et al, 2011) and, since then, many studies have been carried out in cities from other European countries (Andrés-Costa et al, 2016;Baz-Lomba et al, 2016;Gatidou et al, 2016;Mastroianni et al, 2014Mastroianni et al, , 2017Rodríguez-Álvarez et al, 2014Rodríguez-Álvarez et al, , 2015van Wel et al, 2016) Vietnam (Nguyen et al, 2018), China (Gao et al, 2020), United States (Chen et al, 2019, Canada (Ryu et al, 2016), andAustralia (Zheng et al, 2020). The main objective of these studies was not only to investigate spatial differences of alcohol consumption between populations or to assess changes in alcohol consumption due to special events (Andrés-Costa et al, 2016), but also, to compare WBE-derived alcohol estimates with alcohol consumption figures obtained by means of traditional methods, such as, official data provided by the WHO or by national surveying institutions.…”