function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barrio-Amorós, César L. & Brewer-Carías, Charles', 1],
    ['Köhler, Gunther & Townsend, Josiah H. & Petersen, Claus Bo P.', 2],
    ['Köhler, Gunther & Vargas, Joseph', 1],
    ['Nicholson, Kirsten E. & Crother, Brian I. & Guyer, Craig', 4],
    ['Nicholson, Kirsten E. & Köhler, Gunther', 1],
    ['Uchoa, Lucas Rafael & Delfim, Fagner Ribeiro', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);