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Emir B, Wieand S, Su JQ, Cha S.Emir B, et al. Among authors: cha s.Stat Med. 1998 Nov 30;17(22):2563-78. doi: 10.1002/(sici)1097-0258(19981130)17:22<2563::aid-sim952>3.0.co;2-o.Stat Med. 1998.PMID: 9839348
Jung SH, Wieand S, Cha SS.Jung SH, et al. Among authors: cha ss.Stat Med. 1995 Oct 30;14(20):2217-25. doi: 10.1002/sim.4780142005.Stat Med. 1995.PMID: 8552898
Wieand S, Cha S.Wieand S, et al. Among authors: cha s.Stat Med. 1992 Jan 15;11(1):5-11. doi: 10.1002/sim.4780110103.Stat Med. 1992.PMID: 1557575Clinical Trial.
Jiao J, Vincent A, Cha SS, Luedtke CA, Oh TH.Jiao J, et al. Among authors: cha ss.Mayo Clin Proc. 2014 Feb;89(2):199-206. doi: 10.1016/j.mayocp.2013.09.021.Mayo Clin Proc. 2014.PMID: 24485133
Burton MC, Warren M, Cha SS, Stevens M, Blommer M, Kung S, Lapid MI.Burton MC, et al. Among authors: cha ss.Am J Hosp Palliat Care. 2016 Apr;33(3):228-32. doi: 10.1177/1049909114554795. Epub 2014 Oct 15.Am J Hosp Palliat Care. 2016.PMID: 25318929
Chandrashekaran S, Dispenzieri A, Cha SS, Kennedy CC.Chandrashekaran S, et al. Among authors: cha ss.Respir Med. 2015 Jan;109(1):122-30. doi: 10.1016/j.rmed.2014.11.005. Epub 2014 Nov 14.Respir Med. 2015.PMID: 25433952Free PMC article.