1071
Three time domain indexes of hemodynamic variability were employed : the standard deviation of mean arterial pressure as a measure of blood pressure variability and the standard deviation of beat - to - beat intervals ( SDRR ) and the root mean square of successive differences in R - wave - to - R - wave intervals as measures of heart rate variability .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities:  
Answer:
 None