I am getting lots of time outs on VE because I think the Citoid extension times out before the service does.
i.e.
Suspiciously these are all journals, i.e.
http://www.apidologie.org/articles/apido/abs/2004/04/M4014/M4014.html
https://www.nature.com/nature/journal/v546/n7660/full/nature22375.html
http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1002947
I think this may be caused by the pubmed service/