Multiple ADC chanell on STM32L011K4T6 ?

Dear ST Forum Members,

I'm experimenting with

 STM32L011K4T6 Nucleo,

with ADC_LowPower Example project, I saw this :

uhADCxConvertedValue = HAL_ADC_GetValue(&AdcHandle);

If I want to use two channels of ADC, what should I modify,

I've done :

//ADCx Channel b GPIO pin configuration
	GPIO_InitStruct.Pin = ADCx_CHANNELb_PIN;
 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(ADCx_CHANNELb_GPIO_PORT, &GPIO_InitStruct);

and

/* Definition of ADCx channels */
#define ADCx_CHANNELa ADC_CHANNEL_4
//Open channelb
#define ADCx_CHANNELb ADC_CHANNEL_3
 
 
/* Definition of ADCx channels pins */
#define ADCx_CHANNELa_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define ADCx_CHANNELa_GPIO_PORT GPIOA
#define ADCx_CHANNELa_PIN GPIO_PIN_4
// Open another channel (channel b)
#define ADCx_CHANNELb_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define ADCx_CHANNELb_GPIO_PORT GPIOA
#define ADCx_CHANNELb_PIN GPIO_PIN_3
 

How can I retrieve the result for Channelb ?

Thanks and kind regards.