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Selective laser melting ( SLM ) has emerged as one of the primary metal additive manufacturing technologies used for many applications in various industries such as medical and aerospace sectors .
 Selective laser melting, SLM, as, metal additive manufacturing, industries, as, aerospace
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 Selective laser melting, SLM, as, metal additive manufacturing, industries, as, aerospace