Question about STM32L152RE Nucleo Board embedded OPAMP

The STM32L152RE Nucleo Board embeds the STM32L152RET6 microcontroller that, according to the data sheet ([]) features 2 rail to rail operational amplifiers. However is not clear to me how to enable these OPAMPs and what pins are connected to the OPAMP inputs and output. Is there any way to use the OPAMPs with MBED? Or an assembly code must be used? Anyone knows some code examples on the OPAMPs usage?