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A key parameter that needs to be considered in designing a biodegradable metallic implant is its degradation rate in human body .
 concept or principle: parameter; material: be; application: biodegradable metallic implant; process characterization: degradation rate
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:
 concept or principle: parameter; material: be; application: biodegradable metallic implant; process characterization: degradation rate