Cross-over studies

Hydrogen sulfide and traffic-related air pollutants in association with increased mortality: a case-crossover study in Reykjavik, Iceland
Ragnhildur Gudrun Finnbjornsdottir, Anna Oudin, Bjarki Thor Elvarsson, Thorarinn Gislason, Vilhjalmur Rafnsson

BMJ Open Apr 2015, 5 (4) e007272; DOI: 10.1136/bmjopen-2014-007272

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Cross-over studies