anchor.diff:  RDW: red cell distribution width
   
   
  +RMSSD: root mean square of the successive differences of inter beat intervals
  +
  +
   RQmax: maximum respiratory quotient during treadmill fitness test
   
   
  
positive.code: 
  PUFA: polyunsaturated fatty acids
  
  === Q
  
  QC: quality control
  
negative.code: S2ESBP: stage 2 exercise systolic blood pressure
  
  
  SDNN: standard deviation of the normal-to-normal inter beat intervals
  
  
  serum TG: serum total triglyceride content
  
  
  