Chalk it up to experience.
Jones
M
M
D000293:Adolescent; D016477:Artifacts; D002119:Calcium Carbonate; D005260:Female; D006173:Gymnastics / Q000293:injuries*; D006801:Humans; D007718:Knee Injuries / Q000000981:diagnostic imaging*; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging; D011859:Radiography
D002119:Calcium Carbonate