Article History
Received: 9 May 2020
Revised: 2 November 2020
Accepted: 2 December 2020
First Online: 22 December 2020
Compliance with ethical guidelines
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: J. H. Koo, K. Y. Ong, Y. T. Yap and K. Y. Tham declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. For images or other information within the manuscript which identify patients, consent was obtained from them and/or their legal guardians.