also null out survey id
also null out survey id

squirrelo/american-gut-web,josenavas/american-gut-web,biocore/american-gut-web,squirrelo/american-gut-web,josenavas/american-gut-web,biocore/american-gut-web,squirrelo/american-gut-web,biocore/american-gut-web,josenavas/american-gut-web