Once is enough.
Wootton
F T
FT
Eastern Virginia School of Medicine, Norfolk, USA.
D000009:Abdominal Muscles / Q000000981:diagnostic imaging; D004750:Enteral Nutrition / Q000379:methods*; D020699:Gastroscopes; D005773:Gastroscopy / Q000379:methods; D005774:Gastrostomy / Q000379:methods*; D006801:Humans; D010173:Palpation; D011859:Radiography; D019564:Unnecessary Procedures