2
4
5
7
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11
by Berger, P.
Published in Science (1978)
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12
by Berger, P
Published in Omega (1976)
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14
by Berger, P. A.
Published in BMJ (1969)
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15
by Berger, P., Laier, A., Velho, L.
published 2013
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17
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