TY - JOUR AN - 3 AU - Looker,A.C. AU - Pfeiffer,C.M. AU - Lacher,D.A. AU - Schleicher,R.L. AU - Picciano,M.F. AU - Yetley,E.A. TI - Serum 25-hydroxyvitamin D status of the US population: 1988–1994 compared with 2000–2004 JO - Am J Clin Nutr PY - 2008 VL - 88 SP - 1519-1527 M2 - 1519 DO - 10.3945/ajcn.2008.26182 ER -