In clinical medicine, a<unk> is a person who serves as a witness for both a patient and a medical practitioner as a safeguard for both parties during a medical examination or procedure. The exact responsibilities vary according to the clinical situation.<unk>  are widely used for gynecological and other intimate examinations. A<unk> may support the patient with reassurance and emotional support during a procedure or examination that the patient may find embarrassing or uncomfortable. The<unk> may also provide practical help to the doctor during an examination or procedure. In other clinical settings the<unk> could protect the doctor from physical attack. As a witness, the<unk> can help the doctor disprove unfounded allegations having been present during a procedure and witnessed continuing consent. A<unk> should not be someone with a close connection to either the doctor or the patient, such as a family member.
Chaperone 
EpiCeram
Mirificin
Exfoliatin
Anisatin
Apamin
Zonulin
Erdosteine