Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=30216406.ui
	subscription/membership/fee required	Wiley	https://doi.org/10.1111/bjd.17203
Cited by Patents in	free resource	The Lens - Patent Citations Database	https://www.lens.org/lens/search/patent/list?q=reference_cited.nlp.ids.pmid:30216406
	free resource	scite Smart Citations	https://scite.ai/reports/30216406
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/bjd/article-lookup/doi/10.1111/bjd.17203