1392
This study examines the effects of hypovolemia on the extracellular ptO2 and ptH distributions at multiple tissue sites using a recently developed multipoint microelectrode , that provides simultaneous measurements of ptO2 and ptH .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None