Satomura K, Kitamura T, Kawamura T, et al (Great Cold Investigators-I). Prevention of upper respiratory tract infections by gargling: a randomized trial. Am J Prev Med 2005; 29: 302-307.
Kawamura T, Kondo H, Hirai M, et al. Sudden death in the working population: a collaborative study in central Japan. Eur Heart J 1999 Mar; 20: 338-343.