Knowledge, attitudes and intended behaviours towards HIV testing and self-protection: a survey of Omani pregnant womenA.A. Al-Jabri, R.M. Youssef, S.S. Hasson, A.A. Balkhair, M. Al-Belushi, M. Al-Saadoon, M. Mathew, S. Al-Mahroqi, E. Said, C.Y. Koh and M.A. Idris