https://www.sciencedirect.com/science/article/pii/S0022347618307753
https://onlinelibrary.wiley.com/doi/abs/10.1111/jmwh.12912
(funded by Bill & Melinda Gates foundation, amusingly)

Yet they have been clamping us early in the Commonwealth countries (including US) since the mid 40's.

Remember to become aware of the clamp, and unclamp. We must not allow them to clamp initially, nor to clamp further.