Kittiwan Sumethkul และ Smonporn Boonyaratavej. (2011) Comparison of mean serum vitamin D level among inactive SLE, active SLE without lupus nephritis and active SLE with lupus nephritis. Chulalongkorn University:ม.ป.ท.Kittiwan Sumethkul และ Smonporn Boonyaratavej. 2011. Comparison of mean serum vitamin D level among inactive SLE, active SLE without lupus nephritis and active SLE with lupus nephritis. ม.ป.ท.:Chulalongkorn University;Kittiwan Sumethkul และ Smonporn Boonyaratavej. Comparison of mean serum vitamin D level among inactive SLE, active SLE without lupus nephritis and active SLE with lupus nephritis. ม.ป.ท.:Chulalongkorn University, 2011. Print.