RT Journal Article SR Electronic T1 The time of blood sampling for osteocalcin determinations. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 133 DO 10.1136/ard.49.2.133-a VO 49 IS 2 A1 J M Nolla A1 A Rozadilla YR 1990 UL http://ard.bmj.com/content/49/2/133.1.abstract AB