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Correspondence: Eng-King Tan, National Neuroscience Institute, Singapore.
Author contributions: TEK and NEO did the first draft and all authors were equally involved in the editing and approval of the final manuscript.
Disclosures: All authors declare no conflict of interest.
The authors acknowledge the support from the National Medical Research Council (STaR and PD LCG 002 to TEK).
© 2020 Published by Elsevier Ltd.