We acknowledge the Bill & Melinda Gates Foundation for a Grand Challenges Exploration Grant during the tenure of which this work was completed. We also acknowledge the generous loan of the Agilent FT-IR by Agilent Technologies Inc. and the technical guidance of Jean-Louis Cabral. We extend our gratitude to Ngosse Saolona Galy Bosco, the regional health minister for Sud-Ubangi Province, DRC, for his assistance in collecting the packages from his region.
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