WARSAW, March 11 (Reuters) - Polish border guards detained a Ukrainian woman who was sentenced in Kazakhstan to 12 years in prison for participating in an organised criminal group trading in human organs and selling 56 kidneys, prosecutors said on Tuesday. The 35-year-old woman, referred to only as Ksenia P. under Polish privacy laws, was detained at a railway crossing between Poland and Ukraine under an Interpol red notice, Marta Petkowska, a spokeswoman for the prosecutor's office in Przemysl, said in a statement. The prosecutors didn't say why the woman wasn't in prison in Kazakhstan at the time she was...