Received: 7 November 2019
Accepted: 29 December 2019
First Online: 13 January 2020
Ethics approval and consent to participate
: The study has been approved by the Institutional Review Board and Ethical Comity of the Faculty of Medicine of Assiut University under the reference number 17100583. An informed written consent was obtained from all participants in the study.
: The corresponding author of the paper clearly states that all authors gave him clear acceptance to publish the paper. All patients included in this research gave written informed consent to publish the data contained within the study. Confidentiality of the patient data were kept throughout the whole study period. All the enclosed images in the manuscript are anonymous carrying no patient identity.
: The authors declare that they have no competing interests.