Add JPSM style

[adam3smith]

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[github-actions]

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Below are some sample citations generated based on your proposed changes:

journal-of-pain-and-symptom-management.csl (new)

(1, 2)
(3, 4)

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1. Hancké B, Rhodes M, Thatcher M eds. Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy. Oxford and New York: Oxford University Press. 2007
2. CSL search by example. Citation Style Editor. 2012. Available from: http://editor.citationstyles.org/searchByExample/. Accessed December 15, 2012.
3. Mares I. Firms and the welfare state: When, why, and how does social policy matter to employers? In: Hall PA, Soskice D, eds. Varieties of capitalism. The institutional foundations of comparative advantage. New York: Oxford University Press; 2001:184–213.
4. Fenner M, Crosas M, Grethe JS, et al. A data citation roadmap for scholarly data repositories. Sci Data 2019;6:28.