the addition of four characters from Latin and Burmese. More recently, a Latin alphabet has been developed using all 26 English letters A to Z and two additional Latin letters Ç (for retroflex R) and Ñ (for nasal sound). To accurately represent Rohingya phonology, this alphabet also uses five accented vowels (áéíóú). It has been recognised by ISO with ISO 639-3 "rhg" code. Religion Due to the fact that members of Burma's Rohingya Muslim population are not considered citizens of the country, they are not protected against discrimination by the Burmese government. Therefore, concerns exist with regard to the community's lack of religious freedom, especially in the legal and political sphere. The overwhelming majority of Rohingya people practice Islam, including a blend of Sunni Islam and Sufism. Significant minorities of the Rohingya practice Hinduism and Christianity. The government restricts their educational opportunities; as a result, many pursue fundamental Islamic studies as their only option. Mosques and madrasas are present in most villages. Traditionally, men pray in congregations and women pray at home. Muslims have often faced obstacles and struggled to practice their religion in the same way as other individuals in Burma. These struggles have manifested themselves in the form of difficulty in receiving approval for the construction of places of worship, whether they be informal or formal. In the past, they have also been arrested for teaching and practising their religious beliefs. Health The Rohingya face discrimination and barriers to health care. According to a 2016 study published in the medical journal The Lancet, Rohingya children in Myanmar face low birth weight, malnutrition, diarrhoea, and barriers to reproduction on reaching adulthood. Rohingya have a child mortality rate of up to 224 deaths per 1,000 live births, more than 4 times the rate for the rest of Myanmar (52 per 1,000 live births), and 3 times rate of rest non-Rohingya areas of Rakhine state (77 per 1,000 live births). The paper also found that 40% of Rohingya children suffer from diarrhoea in internally displaced persons camp within Myanmar at a rate five times that of diarrhoeal illness among children in the rest of Rakhine. Human rights and refugee status The Rohingya people have been described as "one of the world's least wanted minorities" and "some of the world's most persecuted people". Médecins Sans Frontières claimed that the discrimination and human rights challenges which the Rohingya people have faced at the