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@ZBasyouny @PMGPSC A google search seems to suggest it's not completely unheard of. There are nine individuals with pH<=6.5 in these papers. https://t.co/ktR2xvxhUZ https://t.co/Ca1DW5jaKp https://t.co/vey4KpEppY https://t.co/TjZmNqFwGQ