Value of the Fern Test to Confirm or Reject the Diagnosis of Ruptured Membranes is Modest in Nonlaboring Women Presenting with Nonspecific Vaginal Fluid Loss - de Haan, Harmen H; Offermans, Jos P M; Smits, Frans; Schouten, Hubert J A; Peeters, Louis L (American Journal of Perinatology, 1994)