“…The porcine and bovine tissues or organs are most commonly used in insertion experiments [ 25 , 27 , 28 , 42 , 44 , 69 , 74 , 75 , 76 , 119 , 122 , 126 , 127 , 128 , 129 , 130 ]. Meanwhile, many scholars presented artificial phantoms to replace the use of animal organs considering reproducibility, visibility, ethics and morals [ 22 , 46 , 82 , 122 , 133 , 134 , 135 , 136 , 137 ]. Although manmade materials have many advantages, we must make a reasonable selection in accordance with practical considerations owing to the differences between artificial materials and practical organs.…”