| http://www.w3.org/ns/prov#value | - out 0.5 to 100cm.sup.2, preferably about 1 to 50 cm.sup.2 and practically about 2 to 25 cm.sup.2 (e.g. about 2 to 20 cm.sup.2).The total voltage application period (term) can be selected according to the conditions of the voltage application, dose or other factors, and is for example about 24 hours or shorter, preferably about 12 hours or shorter (e.g. about 10 minutesto 7 hours) and more preferab
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