2215-2636 2215-2636 S2215-26362018000200133 10.15517/rk.v42i2.34743 Peru 00 09 2018 00 09 2018 42 2 133 155

2002 8 1998 2003 2009 1999 2000 5 2001 1 2004 1998 2001 1991 1996 2006 1 2009 1 2008 1995 2012 2004 2008 1