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It was approved by the National Ethics Committee and the Ministry of Health of Cameroon (AAR#631-00.12) as well as by the Ethics Committee of the Bangui Medical School (No. 10\/UB\/FACSS\/CSVPR\/11).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"Written informed consent was obtained from all the patients (or their parents, in the case of the nine minors between 13 and 17\u00a0years old).","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}},{"value":"Data could be available on reasonable request. The minute amount of cell-free DNA present in the plasma of human beings makes impossible the availability of material. 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