nested case-control

Effectiveness of seasonal influenza vaccination in patients with diabetes: protocol for a nested case–control study
Ludovic Casanova, Sébastien Cortaredona, Jean Gaudart, Odile Launay, Philippe Vanhems, Patrick Villani, Pierre Verger

BMJ Open Aug 2017, 7 (8) e016023; DOI: 10.1136/bmjopen-2017-016023

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nested case-control