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Salomon Kalou and Hertha Berlin team-mates quizzed over sleeping patterns as Bundesliga club install apps on players' mobiles | The Sun
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Football Soccer - Hertha Berlin v FC Augsburg - German Bundesliga - Olympiastadion, Berlin, Germany - 23/01/16 Hertha Berlin's Salomon Kalou in action REUTERS/Hannibal Hanschke Stock Photo - Alamy
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