1761
RESULTS : Sixty percent in Group A developed postoperative emetic symptoms , headache , or both ; 1 patient in Group B developed symptoms .
 postoperative emetic symptoms, headache
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 postoperative emetic symptoms, headache