2234
Total and ionized serum calcium were acutely increased by 0 . 10 +/- 0 . 07 and 0 . 06 +/- 0 . 03 mmol / L , respectively , 3 hours after calcium citrate administration ( p < 0 . 0001 for both comparisons ) .
 calcium, calcium citrate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 calcium, calcium citrate