@article{doi:10.1001/archpedi.158.3.217,
author = {Cohen HA and Varsano I and Kahan E and Sarrell E and Uziel Y},
title = {Effectiveness of an herbal preparation containing echinacea, propolis, and vitamin c in preventing respiratory tract infections in children: A randomized, double-blind, placebo-controlled, multicenter study},
journal = {Archives of Pediatrics & Adolescent Medicine},
volume = {158},
number = {3},
pages = {217-221},
year = {2004},
doi = {10.1001/archpedi.158.3.217},
URL = { + http://dx.doi.org/10.1001/archpedi.158.3.217},
eprint = {/data/Journals/PEDS/11998/POA30127.pdf}
}