which consisted of two dual channel peristaltic pumps (www.lgpump.com.cn) one 6-port two- position injection valve (www.vici.com) and one 8-position selection valve (www.vici.com,
which consisted of two dual channel peristaltic pumps (www.lgpump.com.cn)one 6-port two- position injection valve (www.vici.com) and one 8-position selection valve (www.vici.com,