Randomized, placebo-controlled double blind study on the efficacy of influenza immunization on absenteeism of health care workers.
Pediatr Infect Dis J. 1999 Sep;18(9):779-83. doi: 10.1097/00006454-199909000-00007.
Pediatr Infect Dis J. 1999.
PMID: 10493337
Clinical Trial.