48,125
Participants
Start Date
October 1, 2018
Primary Completion Date
June 1, 2019
Study Completion Date
December 31, 2019
Letter
Intervention consists of two different types of postal letters reminding elderly citizens (65 years and above) about influenza vaccines that are available free of charge from the local health centers
National Institute for Health and Welfare, Helsinki
RWTH Aachen University
OTHER
University of Erfurt
UNKNOWN
Finnish Institute for Health and Welfare
OTHER_GOV