Meditation practice among the chess elite? My question is simple.  Do we know of any 2700+ caliber players that regularly cite meditation as part of their lifestyle / preparation?

It's not hard to find meditating chess players, but I'm wondering about its use in top practice and perhaps if there are any studies that have attempted to measure its effects.
I found these sources for "meditation" among the past 2 worlds champions:

Carlsen:
https://www.youtube.com/watch?v=ELoJbv4bCHw

Anand:
https://badrirag.wordpress.com/category/viswanathan-anand/

Q : Do you practise meditation and if so, how effective do you find it?

A:  I don’t meditate regularly and hence I do not know the extent to which it can help.

Based on my Google research, some chess players meditate, but I see no evidence proving that top chess players meditate more than the general population