Received: 10 July 2019
Revised: 27 September 2019
Accepted: 3 October 2019
First Online: 15 October 2019
Compliance with ethical standards
: MH, AZJ, KW, MM and MM have no relevant conflicts of interest. TH has served on an advisory board for Galderma.
: All the procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Ethics Committee of the Medical University of Łódź; approval no. RNN/240/09/KE) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.