Kretzschmar, MrivmWalling, JTeunis, PrivmXing, SMikolajczyk, R2025-03-182025-03-1820061693395710.1371/journal.pmed.0030272https://rivm.openrepository.com/handle/10029/641526Frequency of adverse events after vaccination with different vaccinia strainsArticlePLos Med 2006; 3(8):1341-512025-03-18