Alleged victims of the accused child abuser Malka Leifer have expressed their frustration at “questionable characters” being called to delay legal moves to have her extradited from Israel to Australia.

On Tuesday a third psychiatrist called by the defence told a Jerusalem court Leifer was unfit to be extradited.

Dr Sam Tyano, the former director of the Geha psychiatric hospital in Petah Tikva, gave evidence on Leifer’s mental state at a closed hearing in Jerusalem district court.

Tyano stirred controversy in 2011 after claiming in a book on mental health that homosexuality is a symptom of an emotional disorder, and psychotherapy is the cure.

In 2017, when a man called Nadav Sela killed his wife and two children in Israel, Tyano testified that Sela was instructed by God to murder them.

Tyano’s testimony to the court will help decide whether Leifer is fit to be extradited to face 74 charges of rape and child sex abuse.

The charges stem from Leifer’s time as principal at the ultra-orthodox Adass Israel school in Melbourne.

Three sisters who attended the school, Elly Sapper, Dassi Erlich and Nicole Meyer, have been fighting to have her extradited since 2011.

As the extradition trial drags on over the defence’s claims Leifer is mentally unfit to appear in court or face trial in Australia, the sisters expressed their frustration.

“Another hearing, another psychiatrist, 49 court dates! How many more questionable characters will take the stand in defence of Malka Leifer?” the sisters said in a statement.

“When will it be our turn to have our voice heard?”

Two weeks ago, the defence called Dr Brian Tappler to present a psychiatric assessment, the integrity of which has also been questioned.

Tappler had previously announced on Facebook Leifer was innocent of her charges and stated those accusing her were not “frum”, or devout Jews.

The next extradition hearing is set for 15 April.