Comparison of vaccine efficacy must be based on good clinical data–Authors’ reply by Abdul Taib, Nur Asheila, Raja, Dhesi Baha, Kuo, Alvin Jing Teo, Kamarulzaman, Adeeba, William, Timothy, HS, Arvinder Singh, Mokhtar, Siti Aisah, Choo, Yee Ting, Wei, Aun Yap, Yoon, Michelle Kim Chan, Amir, Lidwina Edwin