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UMLS. CSP-HL7-ICD9CM-NCI-NDFRT-RXNORM
%
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
R R R- R0 R1 R2 R3 R4 RA RB RC RD RE RF RG RH RI RK RM RN RO RP RQ RR RS RT RU RV RW RX RY
RA RA- RA4 RAB RAC RAD RAE RAF RAG RAI RAL RAM RAN RAP RAR RAS RAT RAU RAV RAY RAZ

Random Sampling

[A sample derived by selecting sampling units (e.g., individual patients) such that each unit has an independent and fixed (generally equal) chance of selection. Whether or not a given unit is selected is determined by chance, for example, by a table of randomly ordered numbers. ( MCM )]
UMLS (NCI) C0150105
 
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