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UMLS. CSP-HL7-ICD9CM-NCI-NDFRT-RXNORM
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S S S- S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SY
SE SEA SEB SEC SED SEE SEG SEI SEL SEM SEN SEO SEP SEQ SER SES SET SEV SEW SEX SEZ

selection bias

[An error in choosing the individuals or groups to take part in a study. Ideally, the subjects in a study should be very similar to one another and to the larger population from which they are drawn (for example, all individuals with the same disease or condition). If there are important differences, the results of the study may not be valid. ( NCI )]
UMLS (NCI) C0036577
 
Quantitative Concept
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