Which of the following aren't included in the WHO classification of operating dental auxiliaries?
Non-operating auxiliaries

Dental surgery assistant
Dental secretary/receptionist
Dental laboratory technician
Dental health educator

Operating auxiliaries

School dental nurse
Dental therapist
Dental hygienist
Expanded function dental auxiliaries

Essentials of preventive and community dentistry 
Soben Peter 
5th edition
Dental hygienist
School dental nurses
Therapists
Denturists