added hyperlinks to paper (#2007)
added hyperlinks to paper (#2007)

* added hyperlinks to paper

* update hyperlink

* I before A in HTML

* Remove stray P tag

ebmdatalab/openprescribing,annapowellsmith/openpresc,annapowellsmith/openpresc,annapowellsmith/openpresc,annapowellsmith/openpresc,ebmdatalab/openprescribing,ebmdatalab/openprescribing,ebmdatalab/openprescribing