1. Biotechnology Research Center and Department of Biotechnology, Toyama Prefectural University, 5180 Kurokawa, Imizu-shi, Toyama 939-0398, Japan
2. Department of Microbiology, School of Medicine, Dr. José Matías Delgado University, Campus 1, km 8 1/2 Carretera a Santa Tecla, San Salvador 01101, El Salvador
3. Graduate School of Health Sciences, Gunma University, 3-39-22, Showa-machi, Maebashi, Gunma 371-8510, Japan