function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Camper, Jeffrey D. & Torres-Carvajal, Omar & Ron, Santiago R.', 1],
    ['Cisneros-Heredia, Diego F. & Guayasamin, Juan M.', 1],
    ['Guayasamin, Juan M. & Cisneros-Heredia, Diego F.', 1],
    ['Hutter, Carl R. & Guayasamin, Juan M.', 1],
    ['Montilla, Sebastián O. & Arcila-Pérez, Luisa F.', 1],
    ['Twomey, Evan & Delia, Jesse & Castroviejo-Fisher, Santiago', 1],
    ['Velásquez-Álvarez, Álvaro Andrés & Rada, Marco', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=7)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);