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Following the satisfactory results and taking into account that the complications had reduced to a very low rate ( in 2 cases lead tip displacement and pouch haematoma occurred respectively ) , the Authors consider the adopted method an useful approach for PMK implantation particularly when the use of the vena cephalica is deemed impossible .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None