Springer Science+Business Media (the publisher) does not transfer copyright of the paper from the author to the publisher like many other journals. This begs the question, why isn't this article open access? The primary author, Dorothea Schipp, is a statistics consultant in small town Germany [0] not associated with a University and the blood work was done in Slovakia. No PHDs or MDs among them. [1].

Digging deeper into their research method [2] the study looked at DNA breakage over a four month period in blood sampling for a coffee and non-coffee/caffeine group. I have a few questions about this, mainly around how effective the time period and method for determining total DNA stability. How many individual cell gnomes were measured in the before/after? What's the random variance for genome variability among cells in the same body? I suspect the variance is high enough to explain their unbelievably low p.

My guess is that the statistician is having fun with p-hacking [3] while collecting some funding from industry.

[0] https://en.wikipedia.org/wiki/Rosenthal-Bielatal

[1]https://link.springer.com/article/10.1007/s00394-018-1863-2

[2] https://www.mdlinx.com/journal-summaries/coffee-comet-assay-...

[3] http://psychology.wikia.com/wiki/P-hacking