Can't retrieve all the comments of apps

[chgbnu]

I like your script and thank you very much!

But it seems that this script can't retrieve all the comments. For example, I've tried to get the reviews of "iTunes-U" (id: 490217893, Store: United States), but only 26 comments were fetched. I don't think there are only so few comments for all the versions of this app. On the webpage it shows that there are 14561 ratings for this app.

Could you please help me for this issue?