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Pearson EG, Nance PW, Leslie WD, Ludwig S.Pearson EG, et al. Among authors: ludwig s.Arch Phys Med Rehabil. 1997 Mar;78(3):269-72. doi: 10.1016/s0003-9993(97)90032-0.Arch Phys Med Rehabil. 1997.PMID: 9084348Clinical Trial.
Skomro RP, Ludwig S, Salamon E, Kryger MH.Skomro RP, et al. Among authors: ludwig s.Sleep Med. 2001 Sep;2(5):417-22. doi: 10.1016/s1389-9457(01)00110-1.Sleep Med. 2001.PMID: 14592391
Nance PW, Schryvers O, Leslie W, Ludwig S, Krahn J, Uebelhart D.Nance PW, et al. Among authors: ludwig s.Arch Phys Med Rehabil. 1999 Mar;80(3):243-51. doi: 10.1016/s0003-9993(99)90133-8.Arch Phys Med Rehabil. 1999.PMID: 10084430Clinical Trial.
Aljohani N, Rempel BM, Ludwig S, Morris M, McQuillen K, Cheang M, Murray R, Shen GX.Aljohani N, et al. Among authors: ludwig s.Clin Invest Med. 2008;31(3):E131-7. doi: 10.25011/cim.v31i3.3470.Clin Invest Med. 2008.PMID: 18544276
Aljohani N, Rempel BM, Ludwig S, Morris M, Cheang M, Murray R, Bruce S, Shen GX.Aljohani N, et al. Among authors: ludwig s.Clin Invest Med. 2008 Dec 1;31(6):E338-45. doi: 10.25011/cim.v31i6.4919.Clin Invest Med. 2008.PMID: 19032903