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$au = 'PAUL A. HUBBARD,<SUP>1</SUP>' .' WENFENG YU,<SUP>2</SUP>' ... <contributor>WENFENG YU<SUP>2</SUP></contributor> <contributor>HORST SCHULZ<SUP>2</SUP></contributor> <contributor>JUNG-JA P. KIM<SUP>1</SUP></contributor>