RT Journal Article SR Electronic T1 Vitamin D deficiency among Italian children JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1529 OP 1530 DO 10.1503/cmaj.1070102 VO 177 IS 12 A1 Lippi, Giuseppe A1 Montagnana, Martina A1 Targher, Giovanni YR 2007 UL http://www.cmaj.ca/content/177/12/1529.4.abstract