Name	Info	Provider	Link
	subscription/membership/fee required	Australasian Medical Publishing Company	https://www.mja.com.au/public/issues/188_07_070408/letters_070408_fm-5.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=18393756.ui
	subscription/membership/fee required	Wiley	https://doi.org/10.5694/j.1326-5377.2008.tb01705.x