Classification of male pattern baldness?

The first attempts to classify patterns of baldness were described by Beck in 1950 in male white patients, canadian discount viagra online and in 1951 by Hamilton who analyzed hair loss patterns in both white and Chinese patients. Later Norwood in 1975 suggested modification of Hamilton’s classification, dividing the pattern into 7 groups as shown in figure

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Ludwig devised a classification system for the types of androgenic alopecia in women (three types) as shown in figure