To prove that video about endoscopic retrograde cholangiopancreatography (ERCP) combined with written informed consent provides participants more information about the procedure, which can make participants understand the procedure well. Investigators advocate the development of institutional and national guidelines to ensure optimal practices of acquiring informed consent.

Inclusion Criteria:

• All inpatients who will receive ERCP

Exclusion Criteria:

• under 18 years or more than 70 years
• pregnancy or breast-feeding women
• circulatory and respiratory disorders
• mental illness