You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where are leads 1 2 and 3 placed?" whose answer is the limbs.
Each document should contain about 30 words, and these documents should contain useful information.

Query: placement of leads 1 2 and 3
Useful Output:

Doc 1: Just make sure the leads are symmetrical. For example, don't put one lead on the left shoulder and the other lead on the right forearm. I've
Doc 2: A 3-lead configuration requires the placement of three electrodes; one electrode adjacent each clavicle bone on the upper chest and a third electrode adjacent
Doc 3: Uses 3 electrodes (RA, LA and LL) · Monitor displays the bipolar leads (I, II and III) · To get best results – Place electrodes on the chest wall
Doc 4: The patient's chest and all four limbs should be exposed in order to apply the ECG electrodes correctly. There are different methods for
Doc 5: This 12-lead ECG placement guide presents the placements of ECG leads for correct measurement of the heart's electrical activity.