With some 12,000 migrants massed at the Greek-Macedonian border, the most vulnerable residents of the makeshift refugee camp there are suffering the most.<br /><br /> Living in filth and exposed to the elements, with food and water in short supply and sanitation facilities scarce, children are falling ill – among them Hani from Iraq.<br /><br /> For the last two days, she has been unable to keep anything down for more than ten minutes, whether it is water, tea or food, explains her father, Hazi Mohammad.<br /><br /> Volunteer doctors do their best but with at least 2,500 children thought to be at the Idomeni border camp, it is a difficult task.<br /><br /> Child refugees & migrants suffering most from border restrictions in southeastern Europe: https://t.co/BeRkgvrcNK pic.twitter.com/SevHxWr2Tp— UNICEF (@UNICEF) 3 mars 2016<br /> <br /><br /> “You can clearly see that the living conditions are affecting the health of the children,” said Cecile van de Konijnenburg, a doctor with the Medecins Sans Frontieres charity.<br /><br /> “When it is raining a
