This study was financially supported by the National Kenaf and Tobacco Board (LKTN) of Malaysia [UPM Vot No.: 6300910]; the Tertiary Education Trust Fund, Nigeria (TETfund) and Usmanu Danfodiyo University, Sokoto-Nigeria (UDUs). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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