English to Vietnamese Medical Medical (general) U, ung thư và ung thư

Yet one of the biggest scandals was revealed by ProPublica who showed that the hundreds of doctors on Big Pharma's payroll, speaking at events, and "educating" your doctors at drug seminars, had actually been accused of professional misconduct, lacked credentials as researchers or specialist, or were disciplined by state boards.

Các bác cho em hỏi credentials ở đây dịch là gì cho hợp.
Em hiểu là họ không đủ tư cách để là researcher hay specialist. Credential là cái làm nên tư cách đó.
Many thanks!!!