During thE tAng ErA, A govErnmEnt DoCtor's AnnuAl sAlAry DEpEnDED upon A thE EFFECtivEnEss oF his trEAtmEnt. B thE ExtEnt oF his mEDiCAl ExpEriEnCE. C thE numBEr oF pEoplE hE hAD suCCEssFully trAinED. D thE BrEADth oF his mEDiCAl ExpErtisE.