Medical centers in spotlight as another US doctor accused of sexual abuse

Case of Zi Alan Cheng, accused of sexual abuse and rape, one of many that speak to institutional failures, advocates say

When prosecutors last week announced a litany of sexual crime charges against the New York City doctor Zhi Alan Cheng, their allegations presented a shocking description of apparent serial predation.

Cheng, a gastroenterologist at New York-Presbyterian-Queens hospital, stands accused of sexually abusing three patients at the medical center - and raping three other women in his apartment.