Gender-focused analysis and opportunities for upgrading within Vietnam's smallholder pig value chains oleh Nga Nguyen-Thi-Duong, Hung Pham-Van, Ha Duong-Nam, Huyen Nguyen-Thi-Thu, Trung Ninh-Xuan, Sinh Dang-Xuan, Fred Unger, Hung Nguyen-Viet, Delia Grace, Delia Grace