Supply and demand.
Waters
A
A
D006801:Humans; D020380:Needs Assessment / Q000458:organization & administration; D009740:Nursing Staff / Q000600:supply & distribution*; D010560:Personnel Selection / Q000458:organization & administration; D010561:Personnel Staffing and Scheduling / Q000458:organization & administration*; D013222:State Medicine / Q000458:organization & administration*; D006113:United Kingdom