DeCS 2018 - Qualifier Hierarchy 
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  /analysis  Q05
      
/blood  Q05.010
      
/cerebrospinal fluid  Q05.020
      
/isolation & purification  Q05.030
      
/urine  Q05.040
/anatomy & histology  Q10
      
/blood supply  Q10.010
      
/cytology  Q10.020
            
/ultrastructure  Q10.020.020
      
/embryology  Q10.030
            
/abnormalities  Q10.030.010
      
/innervation  Q10.040
      
/pathology  Q10.050
/chemistry  Q15
      
/agonists  Q15.010
      
/analogs & derivatives  Q15.020
      
/antagonists & inhibitors  Q15.030
      
/chemical synthesis  Q15.040
/classification  Q17
/diagnosis  Q20
      
/diagnostic imaging  Q20.010
/drug effects  Q22
/education  Q25
/ethics  Q30
/etiology  Q35
      
/chemically induced  Q35.010
      
/complications  Q35.020
            
/secondary  Q35.020.010
      
/congenital  Q35.030
      
/embryology  Q35.040
      
/genetics  Q35.050
      
/immunology  Q35.060
      
/microbiology  Q35.070
            
/virology  Q35.070.010
      
/parasitology  Q35.080
      
/transmission  Q35.090
/history  Q36
/injuries  Q37
/instrumentation  Q38
/methods  Q39
/organization & administration  Q40
      
/economics  Q40.010
      
/legislation & jurisprudence  Q40.020
      
/manpower  Q40.030
      
/standards  Q40.040
      
/supply & distribution  Q40.050
      
/trends  Q40.060
      
/utilization  Q40.070
/pathogenicity  Q42
/pharmacology  Q45
      
/administration & dosage  Q45.010
      
/adverse effects  Q45.020
            
/poisoning  Q45.020.010
            
/toxicity  Q45.020.020
      
/agonists  Q45.030
      
/antagonists & inhibitors  Q45.040
      
      
/pharmacokinetics  Q45.070
/physiology  Q50
      
/genetics  Q50.010
      
/growth & development  Q50.020
      
/immunology  Q50.030
      
/metabolism  Q50.040
            
/biosynthesis  Q50.040.010
            
/blood  Q50.040.020
            
/cerebrospinal fluid  Q50.040.030
            
/deficiency  Q50.040.040
            
/enzymology  Q50.040.050
            
/pharmacokinetics  Q50.040.060
            
/urine  Q50.040.070
      
/physiopathology  Q50.050
      
/secretion  Q50.060
/policies  Q51
/psychology  Q52
/radiation effects  Q53
/statistics & numerical data  Q55
      
/epidemiology  Q55.010
            
/ethnology  Q55.010.010
            
/mortality  Q55.010.020
      
/supply & distribution  Q55.020
      
/utilization  Q55.030
/therapeutic use  Q60
      
/administration & dosage  Q60.010
      
/adverse effects  Q60.020
      
      
/poisoning  Q60.040
/therapy  Q65
      
/diet therapy  Q65.010
      
/drug therapy  Q65.020
      
/nursing  Q65.030
      
/prevention & control  Q65.040
      
/radiotherapy  Q65.050
      
/rehabilitation  Q65.060
      
/surgery  Q65.070
            
/transplantation  Q65.070.010
/veterinary  Q70