1. Serum ionized magnesium and calcium in women after menopause: inverse relation of estrogen with ionized magnesium 
Ozgul Muneyyirci-Delale, M.D., Vijaya L. Nacharaju, Ph.D., Madar Dalloul, M.D., Burton M. Altura, Ph.D., Bella T. Altura, Ph.D. 
Fertility and Sterility 
Volume 71, Issue 5, Pages (May 1999)
DOI: /S (99)

2. FIGURE 1
Relation between serum estrogen levels (pg/mL) and serum ionized magnesium (Mg2+) levels (mmol) in menopausal women. P=.04.
Fertility and Sterility  , DOI: ( /S (99) )