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Submitted on: 17 July 2021.
Revised on: 22 September 2021.
Accepted on: 10 October 2021.
___________________Frontiers of Medicine---SPRINGER
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Submitted on: 07 May 2020.
Revised on: 15 July 2020.
Accepted on: 24 August 2020.
___________________Frontiers of Medicine---SPRINGER
Submitted on: 03 February 1998.
Revised on: 22 May 1998.
Accepted on: 13 July 1998.
___________________Frontiers of Medicine---SPRINGER