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Figure 1: (left): © Charles Hewitt / Hulton Archive / Getty Images; (right): © iStockphoto.com / SolStock.
Copyright © Apelöga / Getty Images; iStockphoto.com / kickstand; Design Pics www.fotosearch.com; Alexander Raths /123RF; iStockphoto.com / Sean_Warren; iStockphoto.com / STEEX; xalanx / 123RF; iStockphoto.com / Silvia Jansen; Fotosearch.
Audios 1 and 2: images used for illustrative purposes only.
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