Updates are available Correction dated 2020-03-24
Click to view Correction: https://doi.org/10.1186/s40854-020-00183-4
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Authors
Behera, Sujata
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Article History
Received: 5 November 2018
Accepted: 15 December 2019
First Online: 5 February 2020
Change Date: 24 March 2020
Change Type: Correction
Change Details: After publication of this article [1], it is reported this article contained an error in the section ‘Risk-free return (rf)’
Competing interests
: The author declare that he or she has no competing interests.
