Antibiotic use in pig farms at different levels of intensification-Farmers' practices in northeastern Thailand. oleh Gunilla Ström Hallenberg, Jatesada Jiwakanon, Sunpetch Angkititrakul, Seri Kang-Air, Kristina Osbjer, Kamonwan Lunha, Marianne Sunde, Josef D Järhult, Thomas P Van Boeckel, Karl M Rich, Ulf Magnusson