anchor.diff:  too_short_after_quality_trimming(<50bp),integer,non-unique,optional,*,Number of reads too short after quality trimming (<50bp)
   stage,character,non-unique,optional,stage_i|stage_ii|discovery|validation,Acquisition stage/phase
   height,integer,non-unique,optional,*,Subject height (cm)
  -weight,integer,non-unique,optional,*,Subject weight (km)
  +weight,numeric,non-unique,optional,*,Subject weight (km)
   diabetic,character,non-unique,optional,[yn],Is the subject diabetic
   fbg,numeric,non-unique,optional,*,Fasting blood glucose (mmol/L)
   sbp,integer,non-unique,optional,*,Systolic blood pressure (mm Hg)
  
positive.code: snprnt,integer,non-unique,optional,*,SNPRNT
  wmsphase,integer,non-unique,optional,1|2,Acquisition stage/phase
  classification,character,non-unique,optional,igt|ngt|t2d,Classification
  gad-antibodies,numeric,non-unique,optional,*,Glutamic acid decarboxylase antibodies (for units see Bingley et al. Diabetes 52; 1128-1136; 2003) 
  bmi,numeric,non-unique,optional,*,Body mass index (kg/m2)
  whr,numeric,non-unique,optional,*,Waist-to-hip ratio (cm/cm)
  wc,integer,non-unique,optional,*,Waist circumference (cm)
  
negative.code: method,character,non-unique,optional,ss|mock|sw|qq|cut,Acquisition method
  site_characteristic,character,non-unique,optional,moist|mock|sebaceous|toenail|dry,Syte characteristic
  total_initial_reads,integer,non-unique,optional,*,Number of initial reads
  estimated_median_insert_size,numeric,non-unique,optional,*,Estimated median insert size
  reported_as_failed_qc,integer,non-unique,optional,*,Number of reads reported as failed QC
  uniquely_align_to_human,integer,non-unique,optional,*,Number of reads uniquely aligned to human
  non_uniquely_align_to_human_with_0_2_mismatches,integer,non-unique,optional,*,Number of reads non-uniquely aligned to human with 0-2 mismatches
  