In other words, while the estimated prevalence varies wildly according to ethnicity, sex, geographic region, or (most likely) detection methods, extra nipples probably occur fairly rarely. Some evidence has suggested that they more commonly erupt on the left side than the right. Another study reported that 5% of Japanese women but only 1.6% of Japanese men have additional nipples, though most other studies find them to be more common in men than in women. For Israeli infants, the rate was estimated to be 2.5% for Israeli-Arabic children, 4.7% and 5.6% among German children. One study found a prevalence of 0.22% in a Hungarian population another estimated 0.6% of white American infants another claimed that 1.63% of Black American infants have them. There are almost as many guesses as to the prevalence of extra nipples as there are studies on the matter. He estimated that around one in 500 humans, or 0.2%, have "supernumerary nipples" – that is, a number of nipples greater than two. The first formal description of the condition was made in a German scientific journal in 1878 by a researcher called Leichtenstern. A third one, to be exact, though there are humans who have had as many as six additional nipples. Another thing these four individuals have in common is that they have extra nipples. What do Mark Wahlberg, Tilda Swinton, Lily Allen, and Bill Paxton have in common? For one thing they're all very, very famous, but so are lots of people, and you already knew that.
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