Neiman Marcus and Target are not the only US-based retailers that suffered data breaches last year. Reuters has learned that at least three other smaller retailers were targeted by hackers at the end of 2013. Sources familiar with the matter have told the news agency that the other victims are companies with outlets in malls. None of them have been named. Furthermore, its believed that others were also targeted by cybercriminals earlier in 2013. In April and Au…