Association of 25-hydroxyvitamin D with type 2 diabetes among patients undergoing coronary angiography: cross-sectional findings from the LUdwigshafen Risk and Cardiovascular Health (LURIC) Study - Ó Hartaigh, Bríain; Thomas, G. Neil; Silbernagel, Günther; Bosch, Jos A.; Pilz, Stefan; Loerbroks, Adrian; Kleber, Marcus E.; Grammer, Tanja B.; Böhm, Bernhard O.; März, Winfried (Clinical endocrinology <Oxford>, 2013)