A letter to Santa made many people sad: Niksa (11) doesn't want any gifts, he just wants Andrea's "disease to go away and her health to return"

Niksa is worrying for seventeen-year-old Andrea Lazarevic from Banja Luka, who is suffering from a very rare sickness and she needs the medicine eculizumab (Soliris), which costs 320,000 euros a year