The head of Harris County's public health system and two out-of-state physicians with administrative experience are the top candidates for Parkland Memorial Hospital's CEO job. The Parkland board of managers confirmed Monday that it narrowed its search after meeting with six potential candidates in recent weeks. A previous slate of four candidates was made public in late 2012. None got the job. The board is seeking to replace Dr. Ron Anderson. He was forced to step down as president and CEO in December 2011 amid Parkland's regulatory problems.