function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barbar, Ziad', 1],
    ['Heyer, Jacob Den & Castro, Tatiane M. M. G.', 2],
    ['Heyer, Jacob den & Ueckermann, Edward A. & Khanjani, Mohammad', 2],
    ['Paktinat-Saeij, Saeid & Damavandian, Mohammad Reza', 2],
    ['Rostami, Aylar & Bagheri, Mohammad & Jamshidi, Soleyman', 3],
    ['Skvarla, Michael J. & Fisher, J. Ray & Dowling, Ashley P. G.', 1],
    ['Wurlitzer, Wesley Borges & Monjarás-Barrera, José Irving', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);