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. 2017 Feb 15;12(2):e0172050. doi: 10.1371/journal.pone.0172050

Fig 1. The Bidding process, based on the contingent valuation model.

Fig 1

(A) Bidding process to measure WTP for CD4 cell count; (B) Bidding process to measure WTP for Viral load test. Note: *N indicates unwillingness to pay; Y indicates willingness to pay.