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Source of funding: Grants from Stanley Medical Research Institute, Yrjo Jahnsson Foundation, and the Academy of Finland.
▸ Additional notes and a reference list are published online only at http://ebmh.bmj.com/content/vol11/issue2
Competing interests: SS has received honoraria for lectures from Eli Lilly, Astra Zeneca, Bristol Myers Squibb and Janssen, and educational grants from Eli Lilly and Astra Zeneca.
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