Erratum to: Ancient bacteria of the Ötzi's microbiome: a genomic tale from the Copper Age. Issue 1 (December 2017) - Lugli, Gabriele; Milani, Christian; Mancabelli, Leonardo; Turroni, Francesca; Ferrario, Chiara; Duranti, Sabrina; van Sinderen, Douwe; Ventura, Marco