#closed-heart_surgery  heart surgery in which a small incision is made (the chest cavity is not opened)
  supertype:  #heart_surgery__heartsurgery  any surgical procedure involving the heart
  subtype:  #port-access_coronary_bypass_surgery  heart surgery in which a coronary bypass is performed by the use of small instruments and tiny cameras threaded through small incisions while the heart is stopped and blood is pumped through a heart-lung machine
  subtype:  #minimally_invasive_coronary_bypass_surgery  heart surgery in which a coronary bypass is performed on the beating heart by the use of small instruments and cameras threaded through small incisions

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