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Here's a two-month-old summary of a few studies from JAMA Cardiology.[1] The most-quoted result is the Puntmann, et al., which has been amended after scrutiny, but showed pretty much the same pattern of results. Googling "COVID" + "cardiomyopathy" offers some more leads. For example, [2].

[1] https://jamanetwork.com/journals/jamacardiology/fullarticle/...

[2] https://www.medpagetoday.com/infectiousdisease/covid19/88060

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Thanks.

Note that the JAMA editorial acknowledges the need for further studies, because the numbers are very small (compared to the known number of patients):

> We wish not to generate additional anxiety but rather to incite other investigators to carefully examine existing and prospectively collect new data in other populations to confirm or refute these findings.

Which is AFAICS the crux of the matter. No one knows how widespread these problems are.

Not to diminish the need for further research, but [1]. I encourage you to consider the growing number of cases of cardiomyopathy in college athletes, who are presumably in the invincible 18-21 age range and also not particularly numerous as a population.

[1] https://en.m.wikipedia.org/wiki/Further_research_is_needed

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