Opportunity for ethnic Ban pig smallholders involving in improved safe pork value chain: A case study in Hoa Binh province, Northwest Vietnam - Le Thi Thanh Huyen; Le Tien Dung; Han Anh Tuan; Nguyen Thi Phuong Anh; Dinh Khanh Thuy; Sinh Dang-Xuan; Unger, Fred (International Livestock Research Institute, 2023)