1. Prevention and treatment of the common cold: making sense of the evidence;Allan;CMAJ,2014
2. Effects of upper respiratory tract illnesses on mood and performance over the working day;Smith;Ergonomics,2000
3. The economic burden of non-influenza-related viral respiratory tract infection in the United States;Fendrick;Arch Intern Med,2003
4. The common cold in spring during the change of seasons, more attention in young people age group [Internet];Health Insurance Review and Assessment Service (HIRA),2013
5. Efficacy and safety of CVT-E002, a proprietary extract of Panax quinquefolius in the prevention of respiratory infections in influenza-vaccinated community-dwelling adults: a multicenter, randomized, double-blind, and placebo-controlled trial;McElhaney;Influenza Res Treat,2011