A portable microscope and a microscope stage for a portable microscope are disclosed. The invention also provides methods for diagnosing a subject who is suffering from or at risk for developing preeclampsia, and kits for diagnosing such a subject. The anchor pin structures include anchor pin connecting arms and anchor pins. When the back is fully reclined and the seat is fully raised, an upper surface of the seat is coplanar with an upper surface of the back. The invention further provides compositions and methods for treating post-surgical articular or incisional pain in a patient as well as a catheter for use in the methods of the invention. The coupling includes a locking collar and coupling body with a ramp.