4 · Society, Civilization, Culture
49 · education, science and learning
49G · medicine, medical science
49G3 · medical examination, medical treatment
49G34 · bleeding, blood-letting, e.g.: with the aid of cupping-glasses
49G341 · bleeding, blood-letting with the aid of blood-suckers
49G341(+5) · bleeding, blood-letting with the aid of blood-suckers (+ scientific research)
49G341(+53) ·
bleeding, blood-letting with the aid of blood-suckers (+ observation ~ scientific research)