There's probably more than just one cause, said Lawson's surgeon, Dr. Steven Lee-Kong, chief of colorectal surgery at Hackensack University Medical Center in New Jersey.

Lawson（患者名字）的外科医生、新泽西州哈肯萨克大学医学中心的结直肠外科主任 Steven Lee-Kong 博士说，可能不止一个原因。