In no way am I devaluing what your friend is trying to achieve and I realise the near-impossible nature of getting 'good data' (see diverse, sizeable) for things like this. But posting this on such a niche forum /could/ introduce unwanted bias. Self-selecting samples, enough said.
I wish your friend luck!
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Drajor regards you indifferently -- what would you like your tombstone to say?
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