Vitamin D assessment in perioperative medicine and critical care : A prospective observational pilot study.
Paul ZajicStefan HeschlMichael SchörghuberPetra Srekl-FilzmaierTatjana StojakovicViktoria WeixlerSieglinde ZelzerKarin AmreinPublished in: Wiener klinische Wochenschrift (2019)
DRKS00009216, German Clinical Trials Registry ( www.drks.de ).