to 
Budding engineers: Thinking about #diversity and #inclusion is important to design good tech.
See example 
https://edition.cnn.com/2021/02/20/health/pulse-oximeters-dark-skin-covid/index.html …
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I could probably write multiple papers about this issue. I was literally the CEO and founder of a MedTech startup trying to address inequality within healthcare. My focus was developing ML techniques to extract diagnostic information from PPG and reduce diversity bias.
Scattering as volume fraction of melanin increases, can be follows predictable patterns which we can model - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412556/ … But when doing more complex analysis we really need demographic data that doesn't exist yet. It's a looming healthcare disaster