Updates are available Expression of concern dated 2021-09-28

Click to view Expression of concern: https://doi.org/10.1007/s12517-021-07600-7

Retraction Retraction dated 2021-11-24

Click to view Retraction: https://doi.org/10.1007/s12517-021-07600-7

Retraction Retraction dated 2021-11-24

Click to view Retraction: https://doi.org/10.1007/s12517-021-09064-1

Updates are available Expression of concern dated 2021-09-28

Click to view Expression of concern: https://doi.org/10.1007/s12517-021-08471-8