Recruitment into antibody prevalence studies: a randomized trial of postcards vs. letters as invitations.

Autor: Ley, Catherine1 (AUTHOR) cley@stanford.edu, Duan, Heying2 (AUTHOR), Parsonnet, Julie1,3 (AUTHOR)
Zdroj: BMC Medical Research Methodology. 7/22/2023, Vol. 23 Issue 1, p1-7. 7p.
Databáze: Academic Search Ultimate
Nepřihlášeným uživatelům se plný text nezobrazuje