NIH:10.2522/pti.20090161 NIH:10.2522/ptj.20060160 NIH:10.2522/ptj.20060232 NIH:10.2522/ptj.20070107 NIH:10.2522/ptj.20080365 NIH:10.2522/ptj.20090062 NIH:10.2522/ptj.20090161 NIH:10.2522/ptj.20090377 NIH:10.2522/ptj.20100167 NIH:10.2522/ptj.20110436 NIH:10.2522/ptj.20130024 NIH:10.2522/ptj.20130100 NIH:10.2522/ptj.20130628