Increasing severity of pectus excavatum is associated with reduced pulmonary function. - Lawson ML; Mellins RB; Paulson JF; Shamberger RC; Oldham K; Azizkhan RG; Hebra AV; Nuss D; Goretsky MJ; Sharp RJ; Holcomb GW 3rd; Shim WK; et al. (The Journal of pediatrics, 2011)