23363
Patients were excluded if they received vancomycin treatment for fewer than 3 days , had preexisting renal failure , or had incomplete serum creatinine ( Scr ) data .
 vancomycin, creatinine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 vancomycin, creatinine