These sentence connectors function to introduce the result (because of this) of a fact, action or event given in previous sentences. Although causative sentence connectors can also be placed within the sentences, they mainly occur at the beginning of sentences, especially in the academic writing of biomedical and engineering fields. When occurring within sentences, they follow the normal rules for positioning adverbs in the sentence (preferably around the verb). Different research fields have preferences in their choice and use of these signals. The only way to get a "feeling" for which connectors and how they are used in your own field is to analyze articles in prominent journals from your own field.