Summary: so safe that the major insurance companies consider the use of nitrous oxide in the same classification as local anesthesia Kevin Toal D D S Furthering Anesthetic History Dr Kevin Toal s study of general anesthesiology began in 1958 and continued on through 1960 in a preceptor program with Dr J Freiheit M D at Lutheran Medical Center in St
Image Dimensions: 123 x 159
Image originally found here.