AU  - Cohen HA, Varsano I, Kahan E, Sarrell E, Uziel Y
TI  - 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
PT  - JOUR
DP  - 2004
TA  - Archives of Pediatrics & Adolescent Medicine
pages = {217-221},
VI  - 158
IP  - 3
AID  - 10.1001/archpedi.158.3.217 [doi]
4100  - http://dx.doi.org/10.1001/archpedi.158.3.217
SO  - Archives of Pediatrics & Adolescent Medicine March 1, 2004 158(3):217