Risk-taking behavior, the second-to-fourth digit ratio and psychological features in a sample of cavers by Sergio Rinella, Andrea Buscemi, Simona Massimino, Vincenzo Perciavalle, Marta Maria Tortorici, Daria Ghiunè Tomaselli, Valentina Perciavalle, Donatella Di Corrado, Marinella Coco

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