1956
In a stepwise logistic regression analysis of SPT and RAST data , the occurrence of serum IgE antibodies to P . orbiculare had the highest explanatory value for current eczema .
 serum IgE antibodies to P . orbiculare
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 serum IgE antibodies to P . orbiculare