Federal law and laboratory referrals.
Barton
H M
HM
Eiland
G W
GW
D005260:Female; D006801:Humans; D007753:Laboratories / Q000191:economics / Q000331:legislation & jurisprudence* / Q000706:statistics & numerical data; D008297:Male; D006278:Medicare; D010820:Physicians; D011331:Private Practice / Q000331:legislation & jurisprudence* / Q000458:organization & administration / Q000706:statistics & numerical data; D014481:United States