Evaluating the physicochemical properties and efficacy of recently expired and aged antivenom products from Thailand and Taiwan by Tan, Kae Yi, Liew, Sin Teng, Tan, Qian Yi, Abdul-Rahman, Farah Nadhirah, Azmi, Nor Izzati, Sim, Si Mui, Tan, Nget Hong, Khomvilai, Sumana, Sitprija, Visith, Tan, Choo Hock