Ziad, a paralysed 14-year-old boy, often stays alone in his room as bombs fall on Douma, the main rebel-stronghold in eastern Ghouta on the outskirts of the Syrian capital Damascus.
Limited in scope, number and size, there are no nearby shelters equipped to receive Ziad who cannot be moved quickly or easily during airstrikes because of his spinal injuries.
Unlike most patients, Abu Zeid lives inside the centre. After his injury, the 23-year-old, whose family lives in a government-controlled area, tried to commit suicide as he struggled to cope with extreme physical pain and come to terms with needing help for basic self-care.
Deep, crater-like scars on Abu Zeid's arms are a reminder of what he endured and a marked contrast with his condition today. Having received treatment, Abu Zeid now has limited mobility, can visit the toilet by himself and is even hopeful he will walk again.
"The doctors say I will walk again, but I need to be patient and exercise a lot," he said.