Math made simple.
Zvara
D A
DA
D000776:Anesthesiology / Q000191:economics / Q000458:organization & administration*; D006801:Humans; D015233:Models, Statistical; D009873:Operating Rooms / Q000191:economics / Q000458:organization & administration*; D013514:Surgical Procedures, Operative / Q000191:economics; D000078329:Workforce