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Such a stiffness mismatch is regarded as one of the most significant problems in implant design as the resulting stress shielding would often lead to implantation failures .
 machanical property: stiffness; material: as; application: implant; engineering feature: design; material: as; machanical property: stress shielding; material: lead; manufacturing process: implantation
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 machanical property: stiffness; material: as; application: implant; engineering feature: design; material: as; machanical property: stress shielding; material: lead; manufacturing process: implantation