Who is the patient with a body weight of 61.97 kg?
body weight of 61.97 kg refers to observations.DESCRIPTION = 'Body Weight' AND observations.VALUE = 61.97; observations.UNITS = 'kg'
SELECT T2.first, T2.last FROM observations AS T1 INNER JOIN patients AS T2 ON T1.PATIENT = T2.patient WHERE T1.DESCRIPTION = 'Body Weight' AND T1.UNITS = 'kg' AND T1.VALUE = 61.97