5230
The pre - and postoperative haemoglobin concentrations in the autologous group were lower by 15 and 10 g / L , respectively , after primary THR and by 10 g / L in both instances after revision THR .
 haemoglobin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 haemoglobin