A divided federal appeals court on Friday reinstated U.S. lawsuits against Pfizer Inc brought by Nigerian families who contend the drugmaker tested a dangerous antibiotic on their children without getting consent... Families of some of the children who participated [in 1996 trials of Trovan] say the tests caused deaths and injuries... Pfizer, based in New York, called the ruling "procedural" and said the decision did not address the merits of the cases.