Acromiohumeral interval
Evans' index
Acromion index
Lateral acromial angle
Kohler line
DeLee and Charnley, and Gruen zones
FDI (Fédération Dentaire Internationale) - World Dental Federation nomenclature for OPG reporting of adult dentition
Squamo-columnar junction - cervix
Ductus venosus flow waveform
Placenta previa spectrum
Variation in placental adherence: diagrams
Variation in placental morphology: diagrams
Variation in cord insertion
Variation in fetal heart rate through gestation
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