Healthcare chain Apollo Hospital Enterprises is in advanced talks with two US firms for a possible takeover as part of its plans to expand in medical business process outsourcing."Hopefully, things would be finalised in the next 3-4 days," Apollo Hospital Enterprises chairman Prathap C Reddy told PTI.The deals, if they go through, would be a shot in the arm for Apollo Health Street, which provides services like processing of receipts and collection of dues to healthcare companies. The deals are also expected to give Apollo Hospitals access to more clients in the US.Reddy said the company has dropped plans to acquire hospital chains in the UK as the prices quoted were very high.The group yesterday entered the health insurance segment through a 74:26 joint venture (JV) with Germany-based DKV AG.