<Krenair> so I tried to generate a citation from "PMCID: PMC2000773" on beta
[...]
<Krenair> so as I said it goes to https://citoid.wikimedia.org/api?action=query&format=mediawiki&search=PMCID%3A%2520PMC2000773
<Krenair> take a look at the result
<Krenair> >>> decodeURIComponent( "PMCID%3A%2520PMC2000773" )
<ecmabot-wm> Krenair: (string) 'PMCID:%20PMC2000773'
<Krenair> check https://citoid.wikimedia.org/api?action=query&format=mediawiki&search=PMCID:%20PMC2000773

First URL does not return anything particularly useful, second one is OK.