3432
Leucovorin rescue was initiated 12 hours after the end of the infusion with a loading dose of 200 mg / m2 followed by 12 mg / m2 every three hours for six doses and then every six hours until the plasma methotrexate level decreased to less than 1 X 10 ( - 7 ) mol / L .
 Leucovorin, methotrexate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Leucovorin, methotrexate