[Koha] import patrons

Hi there. There is a perl script like bulkmarcimport.pl (script to import biblio record and items) to import patrons? By staff client I can import the patrons but there is something wrong... Because I have a file with almost 6600 patrons and by staff client only 5500 patrons are imported. I've checked and there isn't two patrons with the same cardnumber. So I've wanted to check if there is another way to import patrons that gives more feedback about import and if ocurres some errors in the process. Regards. Vitor Fernandes