Prevalence and factors associated with probable obstructive sleep apnea among patients with hypertension in two primary care clinics in Miri, Sarawak, Malaysia by Ching, Siew Mooi, Singh, Rajvinder, Azmi, Fatimah Shahidah, Chong, Khian Lu, Ong, Cynthia Ruey Shyuan, Ayob, Nur Afiqah, Patil, Mansi, Lee, Kai Wei, Ramachandran, Vasudevan, Arora, Viresh