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As of 2014, the Ross procedure comprises less than 1% of all aortic valve replacements in North America. [1] The procedure was first performed using the subcoronary method in 1967 by Donald Ross, for whom the procedure is named. [8] [11] The root replacement method was introduced in the early 1970s. [8]
Cost per procedure, sometimes known as price per procedure, is a medical pricing model which describes the average cost of receiving a certain medical procedure. [ 1 ] References
Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.
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