Assessing the relationship between organic farming practices and microbiological characteristics of organic lettuce varieties ( Lactuca sativa L.) grown in Sao Paulo, Brazil - Maffei, Daniele Fernanda; Moreira, Débora Andrade; Silva, Marcelo Belchior Rosendo da; Faria, D. B; Saldaña, E; Ishimura, I; Landgraf, Mariza; Franco, Bernadette Dora Gombossy de Melo (Journal of Applied Microbiology, 2019)