function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bowles, David E. & Contreras-Ramos, Atilano', 1],
    ['Liu, Xingyue & Flint, Oliver S. & Yang, Ding', 5],
    ['Liu, Xingyue & Yang, Ding & Hayashi, Fumio', 2],
    ['Martins, Caleb C. & Ardila-Camacho, Adrian', 1],
    ['Piraonapicha, Kanyakorn & Sangpradub, Narumon', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);