What is the purpose of AT0, AT1, AT2 and AT3 pins in STM32WB55 MCU?

[KB V.1]

In P-NUCLEO-WB55 schematics, the pins are connected as shown below. I was not able to find much info from datasheet other than that its related to RF functionality. Can i leave it open if i am making a custom board with STM32WB55 controllers?

[Uwe Bonnes]

As written: "Reserved Production Test Pins"