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Ballard RD, Kelly PL, Martin RJ.Ballard RD, et al. Among authors: martin rj.Chest. 1988 Jan;93(1):128-33. doi: 10.1378/chest.93.1.128.Chest. 1988.PMID: 3335143
Leung DY, Martin RJ, Szefler SJ, Sher ER, Ying S, Kay AB, Hamid Q.Leung DY, et al. Among authors: martin rj.J Exp Med. 1995 Jan 1;181(1):33-40. doi: 10.1084/jem.181.1.33.J Exp Med. 1995.PMID: 7807013Free PMC article.