Marketing Firm for China

I am looking for an experienced sales and marketing firm who is based in China. This firm will collaborate with my firm and provide services such as website design, either in-house or through sub contract, and other marketing services such as sales and marketing strategy, public relations, sales and lead generation and other sales and marketing activities. Please provide a portfolio of your projects and services you offered and to what industries you have serviced. In addition, please provide references. I will pick a firm who has the best match for my business objectives and will look to build a long term relationship. I may pick more than one firm from different areas. Let me know if you have any questions. Thank you, Harry