Part 1: Friable mask particulate and lung vulnerability:
https://pdmj.org/papers/masks_false_safety_and_real_dangers_part1
Part 2: Microbial challenges from masks
https://pdmj.org/papers/masks_false_safety_and_real_dangers_part2
Part 3: Hypoxia, hypercapnia and physiological effects
https://pdmj.org/papers/masks_false_safety_and_real_dangers_part3
Part 4: Proposed mechanisms by which masks increase risk of COVID-19
https://pdmj.org/papers/masks_false_safety_and_real_dangers_part4
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