the cited article by the author does not say thread diameter at

medical and non-medical facemasks’ thread diameter ranges from 55 µm to 440 µm [micrometers (one millionth of a meter), which is more than 1000 times larger [25].
 

[25]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7185834/

 

所有跟帖： 

• There is a correction notes with a table. -Uusequery- ♀ (0 bytes) () 04/19/2021 postreply 16:22:38

• 只有一个作者，是个“Clinical Exercise Physiologist”。写些川粉喜欢的文章倒是可以出名。 -voiceofme- ♂ (1065 bytes) () 04/19/2021 postreply 16:23:41