Took out mask reference

Moved to issue #17
DoESLiverpool · Mar 28, 2020 · f42de3d · f42de3d
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@@ -43,11 +43,3 @@ Any other useful things for people to go and check out...
     (Currently they have a total of 477 printers)
 
 ## References
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-### Masks
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-* [Please join me in wearing a mask](https://medium.com/@thejanellemj/please-join-me-in-wearing-a-mask-71e0e3f4fe4a)
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->A study from City University of Hong Kong found that the efficacy of a mask made at home out of two pieces of paper towel + a tissue “…were proven to have achieved 80 to 90 per cent of the function of regular surgical masks in terms of their filtration of aerosol and droplets.
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-^ Needs professional substantiation