Source: book name-cancer: a very short introduction.

i hope u would get some help from it . however it is based on developing ur writing skills. so try ur level best . i have just given a sample how to write preface. however, it is the preface that reflects what u have written in it . so u better can make a better preface than me . best of luck champĀ 

if require further u may ask me without any hesitation.