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The EPM apparatus (EP151, Insight Ltda., Ribeirão Preto, Brazil) was made of wood and consisted of two opposing open arms (50 cm × 10 cm) and two opposing enclosed arms (50 cm × 10 cm × 30 cm) mounted at an angle of 90°, all facing a central platform (10 cm × 10 cm), elevated 40 cm from the floor.
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