196982
Arias Stella 's research showed that " hypoxia-induced thickening of the pulmonary arteriolar walls " was the main cause for the hypertension .
 Arias Stella
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arias Stella