Multicentre case–control study of pneumococcal infections among children with pneumonia in Peninsular Malaysia (MY-Pneumo): a study protocol oleh Nurul Hanis Ramzi, Andrew Tan Chun Hoong, Nur Alia Johari, Anna Marie Nathan, Cindy Shuan Ju Teh, Norhayati Aida Sulaiman, Mohamad Ikram Ilias, Zakuan Zainy Deris, Siti Nur Haidar Hazlan, Nur Syafiqah Mohamad Nasir, Asrar Abu Bakar, Muhd Alwi Muhd Helmi, Wan Khairunnisa Wan Juhari, Norhidayah Kamarudin, Chun Wie Chong, David W. Cleary, Stuart C. Clarke, Lokman Hakim Sulaiman