| http://www.w3.org/ns/prov#value | - Obviously, one of the most important parameters is the substrate itself, which must be reproducible in order to reduce variations in SPF results.11, 12 Indeed, the reproducibility of substrate roughness is critical and a primary concern for assuring reliable in vitro UV values, as has previously been demonstrated.2 Furthermore, recent methods and standards13 recommend plates with strictly controll
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