“…Several papers were presented by Quah (1993Quah ( , 1996aQuah ( , 1996c). Since then, many researchers have employed this method (for example, Jones, 1997, Fingleton, 1999, Magrini, 1999, Rey, 2001, Bickenbach and Bode, 2003, Epstein et al, 2003, Li, 2003, Gallo, 2004, Le Gallo, 2004, Sakamoto, 2007, Bosker and Krugell, 2008, Geppert and Stephan, 2008, Sakamoto and Islam, 2008.…”