This work demonstrates how bioguid and iSpiders link references using Crossref OpenURL, enhancing research connectivity.
David Shorthouse and Rod Page have developed some great tools for linking references by tying together a number of services and using the Crossref OpenURL interface amongst other things.
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Ed Pentz (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: