Changes
changed PMC test limit to 8000000, since PMCs greater than 7000000 have now been issued, see https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7003341/
local function pmc(id, embargo)
local test_limit = 70000008000000; -- update this value as PMCs approach
local handler = cfg.id_handlers['PMC'];
local err_cat = ''; -- presume that PMC is valid
local function pmid(id)
local test_limit = 3200000033000000; -- update this value as PMIDs approach
local handler = cfg.id_handlers['PMID'];
local err_cat = ''; -- presume that PMID is valid