Erratum regarding missing Declaration of Competing Interest statements in previously published articles

Abstract

[This corrects the article DOI: 10.1016/j.joto.2019.11.003.][This corrects the article DOI: 10.1016/j.joto.2019.09.004.][This corrects the article DOI: 10.1016/j.joto.2019.09.003.][This corrects the article DOI: 10.1016/j.joto.2019.12.001.][This corrects the article DOI: 10.1016/j.joto.2018.11.009.].