Hi, 71 year male, 5 6 , 105 lbs, -4.6 lumbar density, -3.2 hips. Have heard about electrical stimulation as effective in adding significant bone density in rat research (http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X0000). Any advice as to effectiveness in humans, what kind of device, where do I buy one? Thanks