The same annual dose of 292 000 IU of vitamin D(3) (cholecalciferol) on either daily or four monthly basis for elderly women: 1-year comparative study of the effects on serum 25(OH)D(3) concentrations and renal function.
Pekkarinen T, Välimäki VV, Aarum S, Turpeinen U, Hämäläinen E, Löyttyniemi E, Välimäki MJ.
Clin Endocrinol (Oxf). 2009 May 25. [Epub ahead of print]
PMID: 19486025
DOI: 10.1111/j.1365-2265.2009.03637.x