Meta-analyses on Vitamin D in critically ill patients: What data can tell us.

Putzu A Department of Cardiovascular Anesthesia and Intensive Care, Cardiocentro Ticino, Lugano, Switzerland.
Belletti A Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy.
Cassina T Department of Cardiovascular Anesthesia and Intensive Care, Cardiocentro Ticino, Lugano, Switzerland. Electronic address: tiziano.cassina@cardiocentro.org.
Landoni G Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy; Vita-Salute San Raffaele University, Milan, Italy. Electronic address: landoni.giovanni@hsr.it.