A case of asymptomatic endobronchial lipoma followed for 4 years - Suzuki,N.; Takizawa,H.; Yamaguchi,M.; Matsuzaki,G.; Kiyosawa,H.; Dohi,M.; Ishii,A.; Suko,M.; Oka,T.; Ito,K. (Nippon Kyobu Shikkan Gakkai Zasshi, 1992)