At 6 o’clock in the morning there is just enough light cutting through the front entrance of the thatched home where Ernesto Ortiz, Axel Berky, and a nurse technician from the Peruvian Ministry of Health (MINSA) work alongside each other and ask questions listed on their clipboards. The home belongs to a Peruvian family that has consented to participate in one of the largest baseline health studies ever conducted in the Amazon.